Optical imaging device

Abstract

The invention provides an optical imaging device, which comprises a lens group, a spacing element group and a lens barrel, the lens group 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 from the object side to the image side of the optical imaging device, 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 present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging device. Background Art

[0002] With the advancement of science and technology and the improvement of people's quality of life, users have higher and higher requirements for cameras and other photographic equipment. In the optical imaging device equipped with the photographic equipment, the first lens of the ultra-wide-angle and large-aperture optical imaging device needs to play a role in increasing the wide angle and improving the luminous flux. However, the large negative refractive force of the first lens will greatly refract the light, which can easily produce more obvious internal reflection stray light at the edge of the first lens. Therefore, how to control the inner diameter size of the front end barrel of the optical imaging device, the spacing element, and the optical parameters of the front end lens to reduce stray light while ensuring ultra-wide angle and large aperture is a very important issue. Summary of the invention

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

[0004] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging device. The number of lenses having a focal power in the optical imaging device is six. The optical imaging device includes: a lens group. From the object side to the image side of the optical imaging device, the lens group includes a first lens to a sixth lens arranged sequentially at intervals. The first lens has a negative focal power, the second lens has a positive focal power, the third lens has a positive focal power, the fourth lens has a positive focal power, the fifth lens has a focal power, and the sixth lens has a focal power; a spacer element group. The spacer element group at least includes 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, 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, between half of the maximum semi-field angle Semi-FOV of the optical imaging device and the numerical aperture fno of the optical imaging device, it satisfies: 1 < fno / tan(Semi-FOV) ≤ 1.25; between the effective focal length f of the optical imaging device and the effective focal length f1 of the first lens, it satisfies: -2.3 < f1 / f < -1.2; between 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, it satisfies: -1.45 ≤ (d0s - d1s) / f1 < -0.85.

[0005] According to another aspect of the present invention, there is provided an optical imaging device. The number of lenses with optical power in the optical imaging device is six. The optical imaging device includes: a lens group, from the object side to the image side of the optical imaging device, the lens group includes a first lens to a sixth lens arranged at intervals in sequence. The first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has an optical power, and the sixth lens has an optical power; a spacer element group, the spacer element group at least includes a first spacer element located between the first lens and the second lens and at least partially contacting 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 contacting 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 contacting 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 contacting the image side surface of the fourth lens, a fifth spacer element located between the fifth lens and the sixth lens and at least partially contacting 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 semi-field angle of the optical imaging device Semi-FOV 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 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.

[0006] Further, 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 < (d0s - d0m) / R1 < 1.

[0007] Further, 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 < (d2s - d1m) / (d2m - d3s) < 2.

[0008] Further, 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.

[0009] Furthermore, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis direction of the optical imaging device and the central thickness CT1 of the first lens on 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 along the optical axis direction and the central thickness CT2 of the second lens on the optical axis satisfy: 0.8 < EP12 / CT2 < 1.75.

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

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

[0012] Furthermore, the outer diameter D3s of the object-side surface of the third spacer element and 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 and the effective diameter DT41 of the object-side surface of the fourth lens satisfy: 1.85 < D3m / DT41 < 3.9.

[0013] Furthermore, 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, and the effective focal length f6 of the sixth lens satisfy: -0.15 ≤ (d4m - f5) / (d5s - f6) < 15.75.

[0014] Furthermore, 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: -1.95 < (d0m - d5m) / f6 ≤ 0.5.

[0015] Furthermore, the effective focal length f of the optical imaging device and the distance L from the object-side end face of the lens barrel to the image-side end face of the lens barrel along the optical axis direction of the optical imaging device satisfy: 0.25 < f / L < 0.4.

[0016] Furthermore, 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.

[0017] Applying the technical solution of the present invention, the number of lenses with optical power in the optical imaging device is six. The optical imaging device includes a lens group, a spacer element group, and a barrel. From the object side to the image side of the optical imaging device, the lens group includes a first lens to a sixth lens arranged at intervals in sequence. The first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has an optical power, and the sixth lens has an optical power; the spacer element group at least includes a first spacer element located between the first lens and the second lens and at least partially contacting 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 contacting 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 contacting 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 contacting 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 contacting the image side surface of the fifth lens; the lens group and the spacer element group are accommodated in the barrel; wherein, half of the maximum semi-field angle of the optical imaging device, Semi-FOV, and the numerical aperture of the optical imaging device, fno, satisfy: 1 < fno / tan(Semi-FOV) ≤ 1.25; the effective focal length of the optical imaging device, f, and the effective focal length of the first lens, f1, satisfy: -2.3 < f1 / f < -1.2; the inner diameter of the object side end face of the barrel, d0s, the inner diameter of the object side surface of the first spacer element, d1s, and the effective focal length of the first lens, f1, satisfy: -1.45 ≤ (d0s - d1s) / f1 < -0.85.

[0018] The optical imaging device of the present application uses six lenses with optical power, and the first lens to the sixth lens are arranged at intervals 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 a negative optical power, and under the condition of -2.3 < f1 / f < -1.2, the negative first lens with a large bending force will refract light significantly, so it is easy to generate relatively obvious internal reflection stray light at the edge part of the first lens. By controlling (d0s - d1s) / f1 within a reasonable range, not only can the entry of some light be restricted by the inner diameter of the object side end face of the barrel, reducing the possibility of generating stray light, but also the stray light generated at the edge part of the image side surface 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 enhancing 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 face 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 face of the first spacing element is too large, the shielding ability of the first spacing 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 ensure that the light entering the first lens through the lens barrel is within a reasonable range to avoid the generation of stray light, and can effectively block the internal reflection stray light generated by the refraction of the first lens, effectively improving the imaging quality of the optical imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram showing some parameters of an optical imaging device according to any optional embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of an optical imaging device according to a first embodiment of the present invention is shown;

[0023] Figure 3 A schematic structural diagram of an optical imaging device according to a second embodiment of the present invention is shown;

[0024] Figure 4 A schematic structural diagram of an optical imaging device according to a third embodiment of the present invention is shown;

[0025] Figures 5 to 7 The axial chromatic aberration curve, the astigmatism curve, and the distortion curve of the optical imaging device of the first embodiment are respectively shown;

[0026] Figure 8 A schematic structural diagram of an optical imaging device according to a fourth embodiment of the present invention is shown;

[0027] Fig. 9 A schematic structural diagram of an optical imaging device according to a fifth embodiment of the present invention is shown;

[0028] Fig.10 A schematic structural diagram of an optical imaging device according to a sixth embodiment of the present invention is shown;

[0029] Figures 11 to 13 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device of the fourth embodiment are respectively shown;

[0030] Fig.14 A schematic structural diagram of an optical imaging device according to a seventh embodiment of the present invention is shown;

[0031] Fig.15 A schematic structural diagram of an optical imaging device according to an eighth embodiment of the present invention is shown;

[0032] Fig.16 A schematic structural diagram of an optical imaging device according to a ninth embodiment of the present invention is shown;

[0033] Figures 17 to 19 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device of Example 7 are respectively shown;

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

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

[0036] Fig. 22 The figure shows the stray light distribution diagram of the optical imaging device under the conditions of fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-2.0 in the prior art.

[0037] The above drawings include the following reference numerals:

[0038] P0, lens barrel; E1, first lens; P1, first spacing element; E2, second lens; P2, second spacing element; E3, third lens; P3, third spacing element; E4, fourth lens; P4, fourth spacing element; E5, fifth lens; P5, fifth spacing 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, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0041] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

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

[0043] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0044] In this article, the paraxial area refers to the area 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 area; 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 area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the display-side surface, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

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

[0046] First embodiment

[0047] like Figures 1 to 20As shown, the number of lenses with optical power in the optical imaging device is six. The optical imaging device includes a lens group, a spacer element group, and a barrel. From the object side to the image side of the optical imaging device, the lens group includes a first lens to a sixth lens arranged at intervals in sequence. The first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has an optical power, and the sixth lens has an optical power; the spacer element group at least includes a first spacer element located between the first lens and the second lens and at least partially contacting 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 contacting 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 contacting 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 contacting 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 contacting the image side surface of the fifth lens; the lens group and the spacer element group are accommodated in the barrel; wherein, half of the maximum semi-field angle of the optical imaging device, Semi-FOV, 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 face of the 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 lenses with optical power, and the first lens to the sixth lens are arranged at intervals 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 a negative optical power, and under the condition of -2.3 < f1 / f < -1.2, the negative first lens with a large bending force will refract light significantly, thus easily generating relatively obvious internal reflection stray light at the edge part of the first lens. By controlling (d0s - d1s) / f1 within a reasonable range, not only can the entry of some light be restricted by the inner diameter of the object-side end face of the barrel, reducing the possibility of generating stray light, but also the stray light generated at the edge part of the image side surface 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 enhancing 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 face 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 face of the first spacing element is too large, the shielding ability of the first spacing 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 ensure that the light entering the first lens through the lens barrel is within a reasonable range to avoid the generation of stray light, and can effectively block the internal reflection stray light generated by the refraction of the first lens, effectively improving the imaging quality of the optical imaging device.

[0050] Table 1 below 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 conditions of fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, when (d0s-d1s) / f1 takes different values. The imaging quality of the optical imaging device can be intuitively evaluated through the stray light distribution diagram, and the stray light situation on the imaging surface can intuitively reflect the quality of the imaging.

[0051] Table 1

[0052] Program No. Solution 1 Solution 2 Solution 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 diagram Attached Fig. 20 Attached Fig.21 Attached Fig. 22

[0053] The optical imaging device 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. The step difference between the inner diameter of the object side end face of the lens barrel and the inner diameter of the object side face of the first spacing element is too large, and a large amount of light enters the optical imaging device, resulting in the following Fig.21 The stray light shown is serious. Solution 3 satisfies fno / tan(Semi-FOV)=1.03、f1 / f=-1.21、(d0s-d1s) / f1=-0.3. The step difference between the inner diameter of the object side end face of the lens barrel and the inner diameter of the object side face of the first spacing element is too small, and the light trend is steep, such as Fig. 22 As shown, stray light is still serious.

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

[0055] In the present embodiment, the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel, and the radius of curvature R1 of the object side face of the first lens satisfy the following ratio: 0.55<(d0s-d0m) / R1<1. If the value of (d0s-d0m) / R1 is too large, the inner diameter difference between the object side end face and the image side end face of the lens barrel is too large relative to the radius of curvature of the first lens, which affects the entry of large-angle light into the optical lens, and also increases the stray light reflected from the inner wall of the lens barrel to the imaging surface because the image side end opening of the lens barrel is too large, affecting the imaging quality. If the value of (d0s-d0m) / R1 is too small, the inner diameter difference between the object side end face and the image side end face of the lens barrel is too small relative to the radius of curvature of the first lens, which is not conducive to taking into account both ultra-wide angle and large image surface. By limiting (d0s-d0m) / R1 within a reasonable range, the convex surface design of the object side of the first lens can be used to effectively converge the light entering the first lens, ensuring sufficient light flux while preventing excess light from entering, reducing stray light on 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 of the lens barrel must meet certain specifications to adapt to the corresponding chip area, and reasonably constrain (d0s-d0m) / R1, so that the optical imaging device can meet the requirements of ultra-wide angle and large aperture for field of view and image height.

[0056] In this 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 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 the following conditions: 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 will overly restrict the amount of light passing through, thereby reducing the brightness and resolution of the optical imaging device. If the value of (d2s-d1m) / (d2m-d3s) is too small, the interception effect of edge non-imaging light will be 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 to ensure that the second spacer element balances the angles of incoming and outgoing light, thereby blocking and absorbing excess light and effectively controlling stray light without excessively restricting light, thereby ensuring good imaging quality.

[0057] In this 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, which affects the molding and stability of the third lens and results in a decline in the quality of the third lens. If the value of (D2m - d2m) / f3 is too small, the protection of the second spacer element for the third lens is insufficient, and the edge portion of the third lens is vulnerable 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 thinner middle and thicker edges in the effective diameter can be reasonably controlled, while ensuring the effective protection of the second spacer element for the third lens, and improving the overall performance and reliability of the optical imaging device.

[0058] In this embodiment, the distance EP01 from the object-side end face 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 central thickness CT1 of the first lens on 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 central thickness CT2 of the second lens on the optical axis satisfy: 0.8 < EP12 / CT2 < 1.75. By controlling EP01 / CT1 within a reasonable range, the first lens can be stably held in the effective position between the lens barrel and the first spacer element, while reducing stray light in the air gap, improving the imaging quality, and ensuring that the first lens maintains good performance under various conditions. By controlling EP12 / CT2 within a reasonable range, the accurate position of the second lens in the optical imaging device can be ensured, displacement caused by vibration or thermal deformation can be reduced, and good heat dissipation capacity can be maintained, improving the reliability and imaging quality of the optical imaging device.

[0059] In this embodiment, the following relationships are satisfied between the inner diameter d3s of the object side surface of the third spacer element and the combined focal length f123 of the first lens, the second lens, and the third lens: -0.4 < d3s / f123 ≤ 0.25; and between the inner diameter d3m of the image side surface of the third spacer element and the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens: 0.65 < d3m / f456 < 1.45. By controlling d3s / f123 within a reasonable range and restricting the inner diameter of the object side surface of the third spacer element, the volume and weight of the third spacer element can be controlled, the difficulty of mold processing and forming can be reduced, and the imaging quality can be 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, sufficient light can be ensured to enter the front-end lens, while internal stray light is reduced, the clarity and light flux of the imaging are improved, and good imaging effects can be maintained under various lighting conditions. By controlling d3m / f456 within a reasonable range and restricting the inner diameter of the image side surface of the third spacer element, the volume and weight of the third spacer element can be controlled, the difficulty of mold processing and forming can be reduced, and the imaging quality can be ensured. It can ensure that light passes through the effective diameter of the rear-end lens, reduce scattering and distortion, while ensuring sufficient light flux, and improve the edge image quality and overall imaging quality.

[0060] In this embodiment, the following relationship is satisfied between the central thickness CP3 of the third spacer element in the direction of the optical axis of the optical imaging device and the curvature radius R7 of the object side surface of the fourth lens: 0 < CP3 / R7 < 0.4. The curvature radius of the object side surface of the fourth lens determines the trend of the edge of the effective diameter of the fourth lens, that is, it affects the distance between the edge of the effective diameter and the third lens. If the value of CP3 / R7 is too large, a relatively thick spacer element formed by injection molding or cutting needs to be used between the third lens and the fourth lens, that is, the third spacer element is too thick, resulting in limited space near the object side surface of the fourth lens, affecting the overall design of the lens group and the optimization of the light path. If the value of CP3 / R7 is too small, an ultra-thin spacer element formed by stamping needs to be used between the third lens and the fourth lens, and the third spacer element is too thin, resulting in insufficient structural strength of the third spacer element, which is prone to deformation during assembly or use, affecting the stability and imaging quality of the optical imaging device. By restricting CP3 / R7 within a reasonable range, it can be ensured that the thickness of the third spacer element is designed within a reasonable range, which neither affects the optimization of the light path nor ensures sufficient structural strength, improving the assembly stability of the third lens and the fourth lens and the imaging quality of the optical imaging device.

[0061] In this embodiment, the outer diameter D3s of the object side surface of the third spacer element and 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 and 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 during the molding of the third lens can be improved, ensuring good alignment between the third lens and the third spacer element during the assembly process. At the same time, sufficient light passing ability is guaranteed, improving the light 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 during the molding of the fourth lens can be improved, ensuring an appropriate gap between the third spacer element and the fourth lens, maintaining good structural strength and stable performance. At the same time, sufficient light passing ability is guaranteed, improving the light flux and imaging effect of the optical imaging device, and enhancing the reliability and stability of the optical imaging device.

[0062] In this 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, and the effective focal length f6 of the sixth lens satisfy: -0.15 ≤ (d4m - f5) / (d5s - f6) < 15.75. Due to having a negative optical power, the effective diameter of the fifth lens has a shape that is thinner in the middle and thicker at both sides. 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 overall shape and focal length of the sixth lens. If the value of (d4m - f5) / (d5s - f6) is set improperly, that is, the effective diameters of the fifth and sixth lenses are not designed reasonably, resulting in refraction or scattering of light during the transmission between the fifth lens and the sixth lens, affecting the clarity and color accuracy of imaging. By restricting (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, enabling the sixth lens to have good molding conditions and not being easily extruded and deformed, which can effectively improve the yield and quality of the production of the sixth lens. At the same time, constraining the effective diameter sizes of the fifth lens and the sixth lens within a reasonable range can optimize the light path and improve the clarity and color accuracy of imaging.

[0063] In this embodiment, the inner diameter d0m of the image side of the lens barrel, the inner diameter d5m of the image side of the fifth spacer element, and the effective focal length f6 of the sixth lens satisfy: -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 and determines the image height position of the imaging surface. If the value of (d0m - d5m) / f6 is too large, that is, the space between the lens barrel and the fifth spacer element is too large, unnecessary reflections will occur in the path of the light before it reaches 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, restricting the effective diameter of the light and reducing the brightness and resolution of the optical imaging device. By controlling (d0m - d5m) / f6 within a reasonable range, the inner diameter of the image side of the fifth spacer element and the inner diameter of the image side of the lens barrel can be controlled, ensuring the stability of the bearing while not blocking the light, enabling the optical imaging device to meet the image height specifications and having a good bearing structure, and improving the reliability of the optical imaging device.

[0064] In this embodiment, the effective focal length f of the optical imaging device and the distance L from the object-side end face of the lens barrel to the image-side end face of the lens barrel along the optical axis direction of the optical imaging device satisfy: 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 with respect to the distance from the object-side end face of the lens barrel to the image-side end face of the lens barrel along the optical axis direction, resulting in an overly long length of the optical imaging device, which is not suitable for integration into compact devices and increases unnecessary costs and weight. If the value of f / L is too small, it means that the effective focal length of the optical imaging device is small, resulting in an overly compact optical path design 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, it can be ensured that the optical imaging device reduces aberration and distortion while meeting the requirements of a compact design, ensuring good imaging performance and adaptability. In addition, restricting f / L enables the optical imaging device to meet the back focal size, adapt to the manufacturing process requirements of the backend module packaging, and also meet the space size requirements of the optical imaging device at the whole machine end.

[0065] In this embodiment, the image side surface of the first lens is a concave surface, the object side surface of the fourth lens is a convex surface, and the image side surface of the sixth lens is a concave surface. The image side surface of the first lens is a concave surface, and the light diverges after passing through the first lens. The first lens is located at the front end of the optical imaging device. The negative optical focal length of the first lens can effectively reduce the angle of the light, especially in the ultra-wide-angle scene, which helps to control the smooth trend of the light in the subsequent lenses, thereby reducing edge distortion and chromatic aberration and improving the orthogonality of the picture. The object side surface of the fourth lens is a convex surface, and the fourth lens also has a positive optical focal length, so that when the light passes through the third lens, it is further converged to ensure that the light 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 a concave surface, which can finely adjust the divergence angle of the light, ensure that the light forms an image evenly on the image plane, reduce spherical aberration and coma, and avoid premature focusing of the light to cause 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 using the above software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shape of the software and / or tool used.

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

[0068] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer element usually refers to the maximum outer diameter of the non-trimming portion.

[0069] Second embodiment

[0070] like Figures 1 to 20As shown, the number of lenses with optical power in the optical imaging device is six. The optical imaging device includes a lens group, a spacer element group, and a barrel. From the object side to the image side of the optical imaging device, the lens group includes a first lens to a sixth lens arranged at intervals in sequence. The first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has an optical power, and the sixth lens has an optical power; the spacer element group at least includes 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; the lens group and the spacer element group are accommodated in the barrel; wherein, half of the maximum semi-field angle of the optical imaging device Semi-FOV 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 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.

[0071] Optionally, the optical imaging device of the present application uses six lenses with optical power, and the first lens to the sixth lens are arranged at intervals 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. However, under the conditions of ultra-wide angle and large aperture, the first lens needs to maintain a large bending force, and the light is refracted significantly by the first lens, resulting in severe refraction of the light at the edge of the lens when passing through the first lens, causing internal reflection stray light and reducing the edge sharpness. By controlling (D2m - d2m) / f3 within a reasonable range, it can be ensured that the thickness of the second spacer element along the optical axis will neither overly restrict the free propagation of light nor be unable to effectively block stray light due to insufficient thickness. In addition, by adjusting the focal length of the third lens, the light path can be optimized to ensure that after the initial divergence of the light passing through the first lens, it can be appropriately converged at the third lens, reducing the generation of stray light and significantly improving the imaging quality of the optical imaging device.

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

[0073] The optical imaging device in the present application may use multiple lenses, such as the six lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0074] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification. 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 may also include other numbers of lenses.

[0075] Figure 1 A schematic diagram of dimension marking of an optical imaging device of the present application is shown. Figure 1 Parameters such as d1s, D2m, L, and EP12 are marked in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging device and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0076] The following further describes examples of specific surface shapes and parameters of the optical imaging device applicable to the above-mentioned embodiments 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 implementation methods of the present application.

[0078] Embodiment 1

[0079] like Figure 2 As shown, the optical imaging device of the first embodiment of the present application is described. Figure 2 A schematic structural diagram of the optical imaging device of the first embodiment is shown.

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

[0081] In this embodiment, the first lens E1 has 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 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 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 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 concave. The fifth lens E5 has 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 positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The optical imaging device also has a filter, and the filter has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object passes through S1 to S14 and reaches the imaging surface S15.

[0082] Table 2 shows the basic structural parameters of the optical imaging device of Example 1, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0083] Table 2

[0084] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Effective radius Cone coefficient OBJ Spherical endless 400.0000 S1 Aspheric -2.2742 0.2814 1.54 56.11 1.3680 -0.6798 S2 Aspheric 1.2488 0.2324 0.8294 -0.0629 S3 Aspheric 0.8588 0.4805 1.64 23.53 0.7818 -0.5184 S4 Aspheric 0.9603 0.2967 0.5089 0.0527 STO Spherical endless 0.0512 0.4614 0.0000 S5 Aspheric -111.8940 0.4738 1.54 56.11 0.5124 -99.0000 S6 Aspheric -1.2229 0.0351 0.6442 1.0330 S7 Aspheric 1.9009 0.8673 1.54 56.11 0.8897 -0.2071 S8 Aspheric 82.8886 0.0300 0.9505 -99.0000 S9 Aspheric 59.1402 0.2400 1.67 19.24 0.9145 -39.9398 S10 Aspheric -80.2290 0.0739 0.9706 5.0000 S11 Aspheric 1.0207 0.4973 1.54 55.65 0.9871 -0.8908 S12 Aspheric 1.3543 0.1628 1.2176 -0.1854 S13 Spherical endless 0.2100 1.52 64.20 1.3181 0.0000 S14 Spherical endless 0.5500 1.3717 0.0000 S15 Spherical endless 0.0000 1.5952 0.0000

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

[0086]

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

[0088] Table 3

[0089]

[0090] Figure 5The axial chromatic aberration curve of the optical imaging device of the first embodiment is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging device. Figure 6 The astigmatism curve of the optical imaging device of the first embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curve of the optical imaging device of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field of view angles.

[0091] according to Figures 5 to 7 It can be seen that the optical imaging device provided in the first embodiment can achieve good imaging quality.

[0092] Embodiment 2

[0093] like Figure 3 As shown, an optical imaging device according to the second embodiment of the present application is described, which differs from the first embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0094] Figure 3 The schematic diagram of the structure of the optical imaging device of the second embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, the outer diameter of the image side surface of the second spacing element and the outer diameter of the image side surface of the third spacing element are appropriately reduced, which is conducive to the miniaturization of the optical imaging device while ensuring stable bearing.

[0095] Embodiment 3

[0096] like Figure 4 As shown, the optical imaging device of the third embodiment of the present application is described, which differs from the first embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrel P0, etc. are different.

[0097] Figure 4 The schematic diagram of the structure of the optical imaging device of the third embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, the maximum thickness of the third spacer element along the optical axis is increased, which is beneficial to control the edge thickness ratio of the third lens and the fourth lens, and improve the processability and assembly stability.

[0098] Embodiment 4

[0099] like Figure 8 As shown, the optical imaging device of the fourth embodiment of the present application is described. Figure 8 A schematic structural diagram of an optical imaging device according to a fourth embodiment is shown.

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

[0101] In this embodiment, the first lens E1 has 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 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 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 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 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 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, and the filter has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object passes through S1 to S14 and reaches the imaging surface S15.

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

[0103] Table 4

[0104]

[0105]

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

[0107] Table 5

[0108] Face number 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] Fig.11 The axial chromatic aberration curve of the optical imaging device of the fourth embodiment is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging device. Fig.12 The astigmatism curve of the optical imaging device of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.13The distortion curve of the optical imaging device of the fourth embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field of view angles.

[0110] according to Figures 11 to 13 It can be seen that the optical imaging device provided in the fourth embodiment can achieve good imaging quality.

[0111] Embodiment 5

[0112] like Fig. 9 As shown, the optical imaging device of the fifth embodiment of the present application is described, which differs from the fourth embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrel P0, etc. are different.

[0113] Fig. 9 The structure diagram of the optical imaging device of the fifth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fourth embodiment are omitted. In this embodiment, the wall thickness of the image side end of the lens barrel is appropriately reduced to avoid interference with the light emitted by the sixth lens.

[0114] Embodiment 6

[0115] like Fig.10 As shown, the optical imaging device of the sixth embodiment of the present application is described, which differs from the fourth embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrel P0, etc. are different.

[0116] Fig.10 The structure diagram of the optical imaging device of the sixth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fourth embodiment are omitted. In this embodiment, the wall thickness of the middle part of the lens barrel is moderately reduced, which is conducive to the miniaturization of the optical imaging device.

[0117] Embodiment 7

[0118] like Fig.14 As shown, the optical imaging device of embodiment 7 of the present application is described. Fig.14 A schematic structural diagram of an optical imaging device of Embodiment 7 is shown.

[0119] like Fig.14 As shown, the optical imaging device includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing 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 greater than the inner diameter of the image side end, that is, the lenses and spacing elements are assembled in sequence from the object side, and the image side surface of the sixth lens is against the image side end of the lens barrel.

[0120] In this embodiment, the first lens E1 has negative focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has 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 negative focal power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has negative focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The optical imaging device also has a filter, and the filter has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object passes through S1 to S14 and reaches the imaging surface S15.

[0121] Table 6 shows the basic structural parameters of the optical imaging device of Example 7, wherein the units of the radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0122] Table 6

[0123]

[0124]

[0125] Table 7 shows the coefficients of the higher order terms that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the sixth lens are all aspherical surfaces.

[0126] Table 7

[0127] Face number 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] Fig.17 The axial chromatic aberration curve of the optical imaging device of the seventh embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Fig.18 The astigmatism curve of the optical imaging device of Example 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.19 The distortion curve of the optical imaging device of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0129] according to Figures 17 to 19 It can be seen that the optical imaging device provided in the seventh embodiment can achieve good imaging quality.

[0130] Embodiment 8

[0131] like Fig.15 As shown, an optical imaging device according to Embodiment 8 of the present application is described, which differs from Embodiment 7 in that the distances and thicknesses between the various spacing elements, lenses, lens barrel P0, etc. are different.

[0132] Fig.15 The schematic diagram of the structure of the optical imaging device of the eighth embodiment is shown. For the sake of brevity, some descriptions similar to those of the seventh embodiment are omitted. In this embodiment, the front port diameter of the optical imaging device is larger, the object side opening of the lens barrel is enlarged and the wall thickness is moderately increased, which provides large-angle light imaging while providing a guarantee for the stability of the optical imaging device.

[0133] Embodiment 9

[0134] like Fig.16 As shown, an optical imaging device according to Embodiment 9 of the present application is described, which differs from Embodiment 7 in that the distances and thicknesses between the various spacing elements, lenses, lens barrel P0, etc. are different.

[0135] Fig.16 The schematic diagram of the structure of the optical imaging device of the ninth embodiment is shown. For the sake of brevity, some descriptions similar to those of the seventh embodiment are omitted. In this embodiment, the front port diameter of the optical imaging device is relatively large, the opening of the object side end of the lens barrel is enlarged and the wall thickness is appropriately increased, which provides a guarantee for the stability of the optical imaging device while providing large-angle light imaging. In addition, the inner diameters of the first spacing element and the second spacing element are appropriately reduced, which is conducive to shielding stray light from the front end of the optical imaging device.

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

[0137] Table 8

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

[0140] Table 9

[0141]

[0142]

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

[0144] Table 10

[0145] Parameters / Examples 1 2 3 4 5 6 7 8 9 d1s 1.650 1.669 1.662 1.433 1.420 1.483 1.515 1.541 1.480 d1m 1.626 1.641 1.638 1.433 1.420 1.483 1.515 1.541 1.480 d2s 0.924 0.950 0.900 0.830 0.800 0.742 1.340 1.155 1.202 d2m 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 d3s 1.688 1.617 2.325 1.204 1.240 1.185 1.431 1.431 1.412 d3m 2.921 2.778 1.961 1.204 1.240 1.185 1.710 1.661 1.895 D3s 2.879 2.743 2.879 3.474 3.644 4.911 3.548 3.315 3.655 D3m 3.726 3.532 3.745 3.474 3.644 4.911 2.899 3.098 3.186 d4m 1.863 1.879 1.891 1.543 1.529 1.518 1.646 1.652 1.667 d5s 1.969 1.969 1.998 1.661 1.708 1.713 2.096 2.060 2.052 d5m 1.969 1.969 1.998 1.661 1.708 1.713 2.906 2.060 2.052 d0s 3.074 3.165 3.247 3.681 3.406 3.681 4.323 4.393 4.541 d0m 4.530 4.471 4.533 5.385 5.197 5.313 2.656 2.846 2.833 EP01 0.624 0.641 0.680 0.893 0.802 0.967 0.607 0.693 0.742 EP12 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 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 invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0147] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0148] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0149] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging device, characterized in that: The optical imaging device has six lenses with optical power, and the optical imaging device includes: A lens group, wherein the lens group comprises a first lens to a sixth lens arranged in sequence from the object side to the image side of the optical imaging device, wherein the first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has an optical power, and the sixth lens has an optical power; a spacer element group, wherein 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 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, wherein the lens group and the spacer element group are accommodated in the lens barrel; Wherein, the half of the maximum half field of view angle Semi-FOV of the optical imaging device and the numerical aperture fno of the optical imaging device satisfy the following conditions: 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 spacing element, and the effective focal length f1 of the first lens satisfy the following: -1.45≤(d0s-d1s) / f1<-0.

85.

2. The optical imaging device according to claim 1, characterized in that: 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 the following relationship: 0.55<(d0s-d0m) / R1<1.

3. The optical imaging device according to claim 1, characterized in that: The inner diameter of the second spacing element is the smallest among the inner diameters of all the spacing elements in the spacing element group, and the inner diameter d2s of the object side surface of the second spacing element, the inner diameter d2m of the image side surface of the second spacing element, the inner diameter d1m of the image side surface of the first spacing element, and the inner diameter d3s of the object side surface of the third spacing element satisfy the following: 0.5<(d2s-d1m) / (d2m-d3s)<2.

4. The optical imaging device according to claim 1, characterized in that: 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 the following: 0.5≤(D2m-d2m) / f3<1.

3.

5. The optical imaging device according to claim 1, characterized in that: The distance EP01 from the object-side end face 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 central thickness CT1 of the first lens on 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 central thickness CT2 of the second lens on the optical axis satisfy: 0.8 < EP12 / CT2 < 1.

75.

6. The optical imaging device according to claim 1, characterized in that: The inner diameter d3s of the object-side surface of the third spacer element, and 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, and the 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 according to claim 1, characterized in that: The central thickness CP3 of the third spacer element in the direction of the optical axis of the optical imaging device, and the curvature radius R7 of the object-side surface of the fourth lens satisfy: 0 < CP3 / R7 < 0.

4.

8. The optical imaging device according to claim 1, characterized in that: The outer diameter D3s of the object-side surface of the third spacer element, and 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, and the effective diameter DT41 of the object-side surface of the fourth lens satisfy: 1.85 < D3m / DT41 < 3.

9.

9. The optical imaging device according to claim 1, characterized in that: 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, and the effective focal length f6 of the sixth lens satisfy: -0.15 ≤ (d4m - f5) / (d5s - f6) < 15.

75.

10. The optical imaging device according to claim 1, characterized in that: 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: -1.95 < (d0m - d5m) / f6 ≤ 0.

5.

11. The optical imaging device according to claim 1, characterized in that: The effective focal length f of the optical imaging device, and the distance L from the object-side end face of the lens barrel to the image-side end face of the lens barrel in the direction of the optical axis of the optical imaging device satisfy: 0.25 < f / L < 0.4.

Images