Optical imaging device

Abstract

The present invention provides an optical imaging device. The optical imaging device includes a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group is composed of seven lenses, which are a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; satisfying: 78° < Semi-FOV < 91°; satisfying: 1.7 < DT11 / DT12 < 2.1; satisfying: 2.45 < (d0s - d1s) / EP01 ≤ 3.15. The present invention solves the problem that the optical imaging device with seven lenses in the prior art has the problem that the edge ray direction affects the imaging quality due to meeting the ultra-wide angle requirement.

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] In the field of optical imaging devices, as users' demands for various imaging are increasing, traditional optical imaging devices are facing a series of challenges. As consumers' requirements for image quality are getting higher and higher, traditional wide-angle lenses are gradually unable to meet their needs for shooting details and field of view. Therefore, ultra-wide-angle lenses are favored by users and manufacturers due to their wider shooting field of view and the advantages of being suitable for dark field shooting.

[0003] At present, in order to meet the needs of ultra-wide angle, the existing seven-lens optical imaging device needs to reasonably increase the size of the first lens. However, in this case, the increase in the size of the first lens is likely to cause the refraction of the edge light to be steeper, resulting in a worse final imaging picture.

[0004] That is to say, the optical imaging device with seven lenses in the prior art has the problem that the direction of edge light affects the imaging quality when meeting the ultra-wide angle requirement. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging device to solve the problem that the optical imaging device with seven lenses in the prior art has the problem that the direction of edge light affects the imaging quality when meeting the ultra-wide angle requirement.

[0006] To achieve the above object, according to one aspect of the present invention, an optical imaging device is provided, which includes a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face and an inner ring face, and the inner ring face is stepped; the lens group is composed of seven lenses, and the seven lenses are, in order from the object side to the image side: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; there is an air gap between adjacent two of the first lens to the seventh lens; the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is convex, and the image side surface is concave; the object side surface of the sixth lens is convex, and the image side surface is convex; the object side surface of the seventh lens is convex, and the image side surface is concave; the spacer element group includes a first spacer element placed 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 placed 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 placed 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 placed 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 placed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; the maximum semi-field angle Semi-FOV of the optical imaging device satisfies: 78° < Semi-FOV < 91°; the object-side effective diameter DT11 of the light-transmitting portion of the first lens and the image-side effective diameter DT12 of the light-transmitting portion of the first lens satisfy: 1.7 < DT11 / DT12 < 2.1; the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, and the on-axis distance EP01 from the object-side end face of the lens barrel to the object side surface of the first spacer element satisfy: 2.45 < (d0s - d1s) / EP01 ≤ 3.15.

[0007] According to another aspect of the present invention, there is provided an optical imaging device, including a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face and an inner ring face, and the inner ring face is stepped; the lens group is composed of seven lenses, and the seven lenses are, in order from the object side to the image side: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; the object-side surface of the first lens is convex and the image-side surface is concave; the image-side surface of the third lens is convex; the object-side surface of the fourth lens is convex and the image-side surface is convex; the object-side surface of the fifth lens is convex and the image-side surface is concave; the object-side surface of the sixth lens is convex and the image-side surface is convex; the object-side surface of the seventh lens is convex and the image-side surface is concave; there is an air gap between two adjacent lenses among the first lens to the seventh lens; the spacer element group includes a first spacer element placed 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 placed 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 placed 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 placed 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 placed between the fifth lens and the sixth lens and at least partially in contact with the image-side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and at least partially in contact with the image-side surface of the sixth lens; the maximum semi-field angle Semi-FOV of the optical imaging device satisfies: 78° < Semi-FOV < 91°; the object-side effective diameter DT11 of the light-transmitting part of the first lens and the image-side effective diameter DT12 of the light-transmitting part of the first lens satisfy: 1.7 < DT11 / DT12 < 2.1; the inner diameter d1m of the image-side surface of the first spacer element, the outer diameter D1m of the image-side surface of the first spacer element and the on-axis distance T12 from the image-side surface of the first lens to the object-side surface of the second lens satisfy: 1.8 < (D1m - d1m) / T12 < 5.4.

[0008] According to another aspect of the present invention, an optical imaging device is provided, comprising a lens barrel and a lens group and a spacer element group assembled in the lens barrel, wherein the lens barrel has an object side end face, an image side end face, an outer annular surface and an inner annular surface, and the inner annular surface is stepped; the lens group is composed of seven lenses, and the seven lenses are, in order from the object side to the image side: a first lens with negative optical focal length, a second lens with negative optical focal length, a third lens with positive optical focal length, a fourth lens with positive optical focal length, a fifth lens with negative optical focal length, a sixth lens with positive optical focal length, and a seventh lens with negative optical focal length; an air gap is provided between adjacent two lenses from the first lens to the seventh lens; the spacer element group includes a lens disposed between the first lens and the second lens and a first spacing element at least partially in contact with the image side surface of the first lens, a second spacing element placed 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 spacing element placed 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 spacing element placed 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 spacing element placed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacing element placed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; the maximum half field angle Semi-FOV of the optical imaging device, the total effective focal length f of the optical imaging device and the object side effective diameter DT11 of the light-transmitting portion of the first lens satisfy: 31.8< (Semi-FOV×f) / DT11<37.9; the axial distance EP23 from the image side surface of the second spacing element to the object side surface of the third spacing element, the inner diameter d2s of the object side surface of the second spacing element and the inner diameter d3s of the object side surface of the third spacing element satisfy: 0 mm -1 <EP23 / d2s / d3s<0.15mm -1 .

[0009] Furthermore, an inner diameter d1s of the object side surface of the first spacing element, an inner diameter d2s of the object side surface of the second spacing element, and an effective focal length f2 of the second lens satisfy: -0.23≤(d1s-d2s) / f2≤0.21.

[0010] Furthermore, an inner diameter d1m of the image side surface of the first spacer element, an outer diameter D1m of the image side surface of the first spacer element, and an axial distance T12 from the image side surface of the first lens to the object side surface of the second lens satisfy: 1.8<(D1m-d1m) / T12<5.4.

[0011] Furthermore, an axial distance T12 from the image side surface of the first lens to the object side surface of the second lens, an axial distance T23 from the image side surface of the second lens to the object side surface of the third lens, and an effective focal length f2 of the second lens satisfy: -0.55<(T12+T23) / f2<-0.3.

[0012] Furthermore, the on-axis distance T23 from the image side surface of the second lens to the object side surface of the third lens, the on-axis distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element, and the on-axis distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element satisfy: 0.6 < (EP12 + EP23) / T23 < 1.85.

[0013] Furthermore, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: -0.8 ≤ (f1 - f2) / f12 < -0.2.

[0014] Furthermore, the inner diameter d2s of the object side surface of the second spacer element, the outer diameter D2s of the object side surface of the second spacer element, and the effective image side diameter DT22 of the light transmitting portion of the second lens satisfy: 0.55 < (D2s - d2s) / DT22 < 2.9.

[0015] Furthermore, the spacer element group further includes a second auxiliary spacer element. The second auxiliary spacer element is located between the second spacer element and the third lens, and its image side surface is in partial contact with the object side surface of the third lens. The center thickness CP2 of the second spacer element, the center thickness CP2b of the second auxiliary spacer element, and the on-axis distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: 0 < (CP2 + CP2b) / EP12 < 1.1.

[0016] Furthermore, the outer diameter D2bm of the image side surface of the second auxiliary spacer element, the outer diameter D2bs of the object side surface of the second auxiliary spacer element, the inner diameter d2bm of the image side surface of the second auxiliary spacer element, and the inner diameter d2bs of the object side surface of the second auxiliary spacer element satisfy: 1 ≤ (D2bm - d2bm) / (D2bs - d2bs) ≤ 1.5.

[0017] Furthermore, the spacer element group further includes a second auxiliary spacer element. The second auxiliary spacer element is located between the second spacer element and the third lens, and its image side surface is in partial contact with the object side surface of the third lens. The inner diameter d2bm of the image side surface of the second auxiliary spacer element and the effective focal length f3 of the third lens satisfy: 0.4 < d2bm / f3 < 1.1; the inner diameter d2s of the object side surface of the second spacer element and the effective focal length f2 of the second lens satisfy: -0.75 < d2s / f2 < -0.30.

[0018] Furthermore, the on-axis distance EP03 from the object side end surface of the lens barrel to 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: -0.15 ≤ EP03 / f123 ≤ 0.7.

[0019] Furthermore, the spacer element group further includes a third auxiliary spacer element. The third auxiliary spacer element is located between the third spacer element and the fourth lens, and its image side surface is in partial contact with the object side surface of the fourth lens. The following relationship is satisfied among the central thickness CP3 of the third spacer element, the central thickness CP3b of the third auxiliary spacer element, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens: 0.29 < (CP3 + CP3b) / (CT3 + CT4) ≤ 0.55.

[0020] Furthermore, the spacer element group further includes a third auxiliary spacer element. The third auxiliary spacer element is located between the third spacer element and the fourth lens, and its image side surface is in partial contact with the object side surface of the fourth lens. The following relationship is satisfied between the inner diameter d3bs of the object side surface of the third auxiliary spacer element and the inner diameter d3s of the object side surface of the third spacer element: 0.55 ≤ d3s / d3bs < 1.65.

[0021] Furthermore, the spacer element group further includes a third auxiliary spacer element. The third auxiliary spacer element is located between the third spacer element and the fourth lens, and its image side surface is in partial contact with the object side surface of the fourth lens. The following relationships are satisfied: between the inner diameter d3s of the object side surface of the third spacer element and the curvature radius R6 of the image side surface of the third lens: -2.55 < d3s / R6 < -0.6; between the inner diameter d3bm of the image side surface of the third auxiliary spacer element and the curvature radius R7 of the object side surface of the fourth lens: 0.32 < d3bm / R7 < 1.90.

[0022] Applying the technical solution of the present invention, the optical imaging device of the present application is composed of a lens barrel and seven lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the optical power, surface shape of the seven lenses, the positions of the spacer elements, and setting the optical imaging device to satisfy 78° < Semi-FOV < 91° and 1.7 < DT11 / DT12 < 2.1, the size of the first lens can be effectively controlled to meet the requirements of an ultra-wide angle. By reasonably planning the surface shapes of the lenses, through the combination of lenses with different curvatures, the focusing of light can be better controlled, thereby improving the imaging quality and reducing distortion. However, in this case, the object-side effective diameter of the light-transmitting part of the first lens is more than 1.7 times the image-side effective diameter, resulting in an oversized first lens. At the same time, the difference in the curvature radii on both sides of the first lens is large, which easily causes a steep refraction of marginal rays, and further leads to a deterioration of the imaging picture. Therefore, in the present application, by restricting 2.45 < (d0s - d1s) / EP01 ≤ 3.15, the relationship between the difference in 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 spacer element and the axial distance from the object-side end face of the lens barrel to the object-side face of the first spacer element is reasonably restricted, which can effectively limit the size of the first lens and the difference in the curvature radii on both sides, optimize the refraction effect of marginal rays, thereby weakening the influence of marginal rays on the imaging quality, ensuring the processability while meeting the design requirements of an ultra-wide angle, and improving the overall imaging effect of the optical imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic 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:

[0024] Figure 1 The dimension marking diagram of the optical imaging device according to an optional embodiment of the present invention is shown;

[0025] Figure 2 The schematic structural diagram of the optical imaging device according to Embodiment 1-1 of the present invention is shown;

[0026] Figure 3 The schematic structural diagram of the optical imaging device according to Embodiment 1-2 of the present invention is shown;

[0027] Figure 4 The schematic structural diagram of the optical imaging device according to Embodiment 1-3 of the present invention is shown;

[0028] Figures 5 to 7 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device according to Embodiment 1 of the present invention are respectively shown;

[0029] Figure 8 The schematic structural diagram of the optical imaging device according to Embodiment 2-1 of the present invention is shown;

[0030] Fig. 9 A schematic structural diagram of an optical imaging device according to Embodiment 2-2 of the present invention is shown;

[0031] Fig.10 A schematic structural diagram of an optical imaging device according to Embodiment 2-3 of the present invention is shown;

[0032] Figures 11 to 13 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging device of the second embodiment of the present invention are respectively shown;

[0033] Fig.14 A schematic structural diagram of an optical imaging device according to Embodiment 3-1 of the present invention is shown;

[0034] Fig.15 A schematic structural diagram of an optical imaging device according to Embodiment 3-2 of the present invention is shown;

[0035] Fig.16 A schematic structural diagram of an optical imaging device according to Embodiment 3-3 of the present invention is shown;

[0036] Figures 17 to 19 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging device of the third embodiment of the present invention are respectively shown;

[0037] Fig. 20 An MTF defocus curve diagram is shown when the optical imaging device of an optional embodiment of the present invention satisfies Semi-FOV=88.40°, DT11 / DT12=1.86 and (d0s-d1s) / EP01=2.2;

[0038] Fig.21 An MTF defocus curve diagram is shown when the optical imaging device of an optional embodiment of the present invention satisfies Semi-FOV=88.40°, DT11 / DT12=1.86 and (d0s-d1s) / EP01=2.8;

[0039] Fig. 22 The MTF defocus curve diagram of the optical imaging device of an optional embodiment of the present invention is shown when Semi-FOV=88.40°, DT11 / DT12=1.86 and (d0s-d1s) / EP01=3.5.

[0040] The above drawings include the following reference numerals:

[0041] P0, lens barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; E4, fourth lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; E5, fifth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; E6, sixth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; E7, seventh lens; S13, object side surface of the seventh lens; S14, image side surface of the seventh lens; P1, first spacer; P2, second spacer; P2b, second auxiliary spacer; P3, third spacer; P3b, third auxiliary spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer. 10. Object side end face; 20. Image side end face; 30. Outer annular surface; 40. Inner annular surface. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 the general knowledge 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 concave and convex. For the object side, 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 image side, 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. In this application, the left side is the object side and the right side is the image side.

[0048] In order to solve the problem that the optical imaging device with seven lenses in the prior art cannot meet the ultra-wide angle requirement, resulting in the direction of edge light affecting the imaging quality, the present invention provides an optical imaging device.

[0049] like Figures 1 to 22As shown, in an alternative embodiment of the present application, the optical imaging device includes a lens barrel and a lens group and a spacer element group assembled within the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face, and an inner ring face, and the inner ring face is stepped; the lens group consists of seven lenses, and the seven lenses are, in order from the object side to the image side: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; there is an air gap between adjacent two of the first lens to the seventh lens; the object-side surface of the first lens is convex and the image-side surface is concave; the image-side surface of the third lens is convex; the object-side surface of the fourth lens is convex and the image-side surface is convex; the object-side surface of the fifth lens is convex and the image-side surface is concave; the object-side surface of the sixth lens is convex and the image-side surface is convex; the object-side surface of the seventh lens is convex and the image-side surface is concave; the spacer element group includes a first spacer element placed 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 placed 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 placed 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 placed 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 placed between the fifth lens and the sixth lens and at least partially in contact with the image-side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and at least partially in contact with the image-side surface of the sixth lens; the maximum semi-field angle Semi-FOV of the optical imaging device satisfies: 78° < Semi-FOV < 91°; the ratio between the object-side effective diameter DT11 and the image-side effective diameter DT12 of the light-transmitting portion of the first lens satisfies: 1.7 < DT11 / DT12 < 2.1; the ratio between the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d1s of the object-side surface of the first spacer element, and the on-axis distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element satisfies: 2.45 < (d0s - d1s) / EP01 ≤ 3.15.

[0050] The optical imaging device of the present application consists of a lens barrel, seven lenses, and multiple spacer elements disposed in the lens barrel. By reasonably arranging the optical power, surface shape of the seven lenses, the positions of the spacer elements, and setting the optical imaging device to satisfy 78° < Semi - FOV < 91° and 1.7 < DT11 / DT12 < 2.1, the size of the first lens can be effectively controlled to meet the requirements of an ultra - wide - angle. By reasonably planning the surface shapes of the lenses and combining lenses with different curvatures, the focusing of light can be better controlled, thereby improving the imaging quality and reducing distortion. However, in this case, the object - side effective diameter of the light - transmitting portion of the first lens is more than 1.7 times the image - side effective diameter, resulting in an overly large size of the first lens. At the same time, the difference in the curvature radii on both sides of the first lens is relatively large, which easily causes a steep refraction of marginal rays, thereby deteriorating the imaging picture. Therefore, by restricting 2.45 < (d0s - d1s) / EP01 ≤ 3.15, the relationship between the difference in the inner diameters of the object - side end face of the lens barrel and the object - side face of the first spacer element and the axial distance from the object - side end face of the lens barrel to the object - side face of the first spacer element is reasonably restricted. This can effectively limit the size of the first lens and the difference in the curvature radii on both sides, optimize the refraction effect of marginal rays, thereby weakening the influence of marginal rays on the imaging quality, ensuring the processability while meeting the design requirements of an ultra - wide - angle, and improving the overall imaging effect of the optical imaging device.

[0051] It should be noted that each lens consists of a light - transmitting portion and a supporting portion. The supporting portion is located on the outer peripheral side of the light - transmitting portion and is arranged circumferentially around the light - transmitting portion. The light - transmitting portion is connected to the supporting portion. The light - transmitting portion is used for the passage of imaging light, while the supporting portion is not used for the passage of imaging light and is used to abut against the lens barrel, an adjacent lens, or an adjacent spacer element.

[0052] In addition, as shown in Table 1 below and Figure 20 to Figure 22 shown, on the premise that the optical imaging device satisfies Semi - FOV = 88.40° and DT11 / DT12 = 1.86, Fig. 20 shows the MTF defocus curve graph when the optical imaging device satisfies (d0s - d1s) / EP01 = 2.2, Fig.21 shows the MTF defocus curve graph when the optical imaging device satisfies (d0s - d1s) / EP01 = 2.8, Fig. 22 shows the MTF defocus curve graph when the optical imaging device satisfies (d0s - d1s) / EP01 = 3.5.

[0053] From Figure 20 to Figure 22It can be seen that when (d0s-d1s) / EP01=2.2, the center thickness of the first lens is too large, and the edge field peak of its MTF defocus curve drops, and the performance is poor. When (d0s-d1s) / EP01=3.5, the center thickness of the first lens is too small, the edge field is sensitive to thickness, the field curvature is positive, and the performance is poor. When (d0s-d1s) / EP01=2.8, the field light of its MTF curve is more concentrated, the contrast transfer performance is higher, and the performance is better. It can be seen that when (d0s-d1s) / EP01 is in the range of 2.45 to 3.15, the thickness of the first lens can be guaranteed to be within a reasonable range, avoiding the situation where the curvature radius on both sides of the first lens is large. The refraction effect of the edge light is optimized, thereby weakening the influence of the edge light on the imaging quality and ensuring the imaging quality of the optical imaging device.

[0054] Table 1

[0055]

[0056] In this embodiment, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the effective focal length f2 of the second lens satisfy: -0.23≤(d1s-d2s) / f2≤0.21. By controlling the ratio of the difference between the inner diameters of the object side surfaces of the first spacer element and the second spacer element and the effective focal length of the second lens, it is ensured that the light entering the optical system propagates in the designed direction, thereby reducing the stray light generated here while maintaining the light throughput.

[0057] In this embodiment, the inner diameter d1m of the image side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, and the on-axis distance T12 from the image side surface of the first lens to the object side surface of the second lens satisfy: 1.8<(D1m-d1m) / T12<5.4. By controlling this conditional expression, it is beneficial to limit the aperture of light passing through the first spacer element and control the amount of light passing through. It ensures that the overall imaging quality is maintained within a certain range, avoids large fluctuations in image quality, and avoids strong stray glare caused by invalid light not being blocked.

[0058] In this embodiment, the on-axis distance T12 from the image side surface of the first lens to the object side surface of the second lens, the on-axis distance T23 from the image side surface of the second lens to the object side surface of the third lens and the effective focal length f2 of the second lens satisfy: -0.55<(T12+T23) / f2<-0.3. By controlling the ratio of the positions of the multiple lenses on the optical axis to the effective focal length of the second lens, it is ensured that the distances of light propagation between the first lens, the second lens, and the third lens conform to a certain gradient, and that the deflection range of light when passing through each lens is controlled within a certain range, so that the light propagates more smoothly between the three lenses and the energy loss is smaller.

[0059] In this embodiment, the axial distance T23 from the image side surface of the second lens to the object side surface of the third lens, the axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element, and the axial distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element satisfy: 0.6<(EP12+EP23) / T23<1.85. By controlling this conditional expression, it is ensured that the light illumination of the edge field of view of the optical imaging device can be slowly reduced, which is conducive to improving the uniformity of the illumination of the imaging surface.

[0060] In this embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: -0.8≤(f1-f2) / f12<-0.2. By controlling the ratio of the difference between the effective focal lengths of the first lens and the second lens and the combined focal length of the first lens and the second lens, it is ensured that the magnification and field of view of the optical imaging device meet the design requirements so as to capture a wider scene, while controlling distortion to ensure image quality.

[0061] In this embodiment, the inner diameter d2s of the object side surface of the second spacer element, the outer diameter D2s of the object side surface of the second spacer element, and the image side effective diameter DT22 of the light-transmitting portion of the second lens satisfy: 0.55<(D2s-d2s) / DT22<2.9. By adjusting the proportional relationship between the inner and outer diameters of the second spacer element and the effective diameter of the second lens, the aberration can be balanced, thereby achieving uniform imaging performance in the entire field of view, and realizing a compact design of the optical imaging device while maintaining the optical performance.

[0062] In this embodiment, the spacer element group further includes a second auxiliary spacer element, which is located between the second spacer element and the third lens, and its image side surface is partially in contact with the object side surface of the third lens, and the center thickness CP2 of the second spacer element, the center thickness CP2b of the second auxiliary spacer element, and the axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: 0<(CP2+CP2b) / EP12<1.1. By controlling the ratio of the center thickness of the second spacer element and the second auxiliary spacer element to the axial distance from the image side surface of the first spacer element to the object side surface of the second spacer element, the thickness of each part of the adjacent lenses is made more uniform, which is conducive to ensuring that the moldability is optimized and that the lenses and spacer elements have very high precision dimensions.

[0063] In this embodiment, the following relationships are satisfied among the outer diameter D2bm of the image side surface of the second auxiliary spacer element, the outer diameter D2bs of the object side surface of the second auxiliary spacer element, the inner diameter d2bm of the image side surface of the second auxiliary spacer element, and the inner diameter d2bs of the object side surface of the second auxiliary spacer element: 1 ≤ (D2bm - d2bm) / (D2bs - d2bs) ≤ 1.5. By controlling the ratio relationship between the inner and outer diameters on both sides of the second auxiliary spacer element, it is ensured that light passes through this location in the designed direction, thereby controlling the amount of light entering the third lens, which is beneficial to reducing the stray light generated at this location.

[0064] In this embodiment, the following relationships are satisfied: between the inner diameter d2bm of the image side surface of the second auxiliary spacer element and the effective focal length f3 of the third lens: 0.4 < d2bm / f3 < 1.1; between the inner diameter d2s of the object side surface of the second spacer element and the effective focal length f2 of the second lens: -0.75 < d2s / f2 < -0.30. By controlling these two conditional expressions, the overall sizes of the second lens and the third lens are controlled. While improving the imaging ability, the structures of the second lens and the third lens are optimized, which is beneficial to reducing the corresponding stray light risk.

[0065] In this embodiment, the following relationship is satisfied between the axial distance EP03 from the object side end face of the lens barrel to 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: -0.15 ≤ EP03 / f123 ≤ 0.7. By controlling the ratio relationship between the axial distance from the object side surface of the lens barrel to the object side surface of the third spacer element and the combined focal length of the first lens, the second lens, and the third lens, it is ensured that light propagates among the three lenses according to the design requirements, thereby reducing energy loss while capturing more scenes and ensuring the performance quality.

[0066] In this embodiment, the spacer element group further includes a third auxiliary spacer element, which is located between the third spacer element and the fourth lens, and its image side surface is in partial contact with the object side surface of the fourth lens. The following relationship is satisfied among the central thickness CP3 of the third spacer element, the central thickness CP3b of the third auxiliary spacer element, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens: 0.29 < (CP3 + CP3b) / (CT3 + CT4) ≤ 0.55. By controlling the ratio relationship between the central thicknesses of the third spacer element and the third auxiliary spacer element and the central thicknesses of the third lens and the fourth lens, the relative positions of the third lens and the fourth lens on the optical axis are ensured, so that light passes through the third lens and the fourth lens and then enters the fifth lens along a fixed route, thereby reducing the stray light risk generated at this position and ensuring the overall quality of the image.

[0067] In this embodiment, the following condition is satisfied between the inner diameter d3bs of the object side surface of the third auxiliary spacer element and the inner diameter d3s of the object side surface of the third spacer element: 0.55 ≤ d3s / d3bs < 1.65. By controlling the ratio of the inner diameter of the third auxiliary spacer element to the inner diameter of the third spacer element, it is ensured that the light propagates along a fixed path after passing through the third lens, thereby reducing the risk of stray light generated here.

[0068] In this embodiment, the following condition is satisfied between the inner diameter d3s of the object side surface of the third spacer element and the radius of curvature R6 of the image side surface of the third lens: -2.55 < d3s / R6 < -0.6; the following condition is satisfied between the inner diameter d3bm of the image side surface of the third auxiliary spacer element and the radius of curvature R7 of the object side surface of the fourth lens: 0.32 < d3bm / R7 < 1.90. By controlling these two conditional expressions, it is beneficial to limit the flange sizes of the third lens and the fourth lens, ensure that the flange sizes of the third lens and the fourth lens meet the forming requirements at a specific radius of curvature, conform to the optimal assembly bearing area, and is beneficial to improving the overall structural stability.

[0069] 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. During the simulation using the software and / or tools such as those described above, the surface profiles of the respective lenses can be appropriately adjusted according to the surface profiles自带 by the software and / or tool used.

[0070] In addition, in another alternative embodiment of the present application, an optical imaging device is further provided, which includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face and an inner ring face, and the inner ring face is stepped; the lens group is composed of seven lenses, and the seven lenses are, in order from the object side to the image side: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; the object-side surface of the first lens is convex and the image-side surface is concave; the image-side surface of the third lens is convex; the object-side surface of the fourth lens is convex and the image-side surface is convex; the object-side surface of the fifth lens is convex and the image-side surface is concave; the object-side surface of the sixth lens is convex and the image-side surface is convex; the object-side surface of the seventh lens is convex and the image-side surface is concave; there is an air gap between two adjacent lenses among the first lens to the seventh lens; the spacer element group includes a first spacer element placed 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 placed 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 placed 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 placed 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 placed between the fifth lens and the sixth lens and at least partially in contact with the image-side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and at least partially in contact with the image-side surface of the sixth lens; the maximum semi-field angle Semi-FOV of the optical imaging device satisfies: 78° < Semi-FOV < 91°; the object-side effective diameter DT11 of the light-transmitting part of the first lens and the image-side effective diameter DT12 of the light-transmitting part of the first lens satisfy: 1.7 < DT11 / DT12 < 2.1; the inner diameter d1m of the image-side surface of the first spacer element, the outer diameter D1m of the image-side surface of the first spacer element and the on-axis distance T12 from the image-side surface of the first lens to the object-side surface of the second lens satisfy: 1.8 < (D1m - d1m) / T12 < 5.4.

[0071] The optical imaging device of the present application consists of a lens barrel and seven lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the optical powers of the seven lenses, the positions of the spacer elements, and setting the optical imaging device to satisfy 78° < Semi-FOV < 91° and 1.7 < DT11 / DT12 < 2.1, the size of the first lens can be effectively controlled to meet the requirements of an ultra-wide angle. However, in this case, the object-side effective diameter of the light-transmitting part of the first lens is more than 1.7 times the image-side effective diameter, resulting in an oversized first lens. At the same time, the difference in the curvature radii on both sides of the first lens is relatively large, which easily causes a steep refraction of marginal rays, thereby deteriorating the imaging picture. Therefore, by restricting 1.8 < (D1m - d1m) / T12 < 5.4, it is beneficial to limit the light aperture passing through the first spacer element and control the amount of light passing through. Ensure that the overall imaging quality is maintained within a certain range, avoid the phenomenon of large fluctuations in image quality, and the phenomenon of strong stray glare caused by ineffective light not being blocked.

[0072] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0073] In addition, in another optional embodiment of the present application, an optical imaging device is also provided, including a lens barrel and a lens group and a spacer element group assembled in the lens barrel, the lens barrel having an object side end face, an image side end face, an outer annular surface and an inner annular surface, and the inner annular surface is stepped; the lens group is composed of seven lenses, and the seven lenses are, from the object side to the image side, in order: a first lens with negative optical focal power, a second lens with negative optical focal power, a third lens with positive optical focal power, a fourth lens with positive optical focal power, a fifth lens with negative optical focal power, a sixth lens with positive optical focal power, and a seventh lens with negative optical focal power; there is an air gap between adjacent two lenses of the first lens to the seventh lens; the spacer element group includes a first spacer element placed 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 placed between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a A third spacing element between the lens and the fourth lens and at least partially in contact with the image side surface of the third lens, a fourth spacing element placed 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 spacing element placed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacing element placed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; the maximum half field angle Semi-FOV of the optical imaging device, the total effective focal length f of the optical imaging device and the object side effective diameter DT11 of the light-transmitting portion of the first lens satisfy: 31.8<(Semi-FOV×f) / DT11<37.9; the axial distance EP23 from the image side surface of the second spacing element to the object side surface of the third spacing element, the inner diameter d2s of the object side surface of the second spacing element and the inner diameter d3s of the object side surface of the third spacing element satisfy: 0mm -1 <EP23 / d2s / d3s<0.15 mm -1 .

[0074] The optical imaging device of the present application is composed of a lens barrel, seven lenses arranged in the lens barrel, and a plurality of spacing elements. By reasonably arranging the focal length of the seven lenses, the positions of the spacing elements, and setting the optical imaging device to meet 31.8<(Semi-FOV×f) / DT11<37.9, it can meet the requirements of ultra-wide angles, and at the same time can reasonably balance the size of the first lens to ensure that most of the object light enters the optical system. However, in this case, a large amount of light is reflected between the lenses to cause stray light. Therefore, the present application constrains mm -1 <EP23 / d2s / d3s<0.15mm -1 , which is beneficial to limit the size of the second spacing element and the third spacing element to reasonably intercept stray light.

[0075] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0076] Optionally, the optical imaging device may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0077] The optical imaging device in the present application may use multiple lenses, such as the seven 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.

[0078] 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 seven lenses are described as an example in the embodiments, the optical imaging device is not limited to including seven lenses. If necessary, the optical imaging device may also include other numbers of lenses.

[0079] Figure 1 A schematic diagram of dimension marking of an optical imaging device of the present application is shown. Figure 1 Parameters such as d0s, d3bm, d3bs, d3s, D2bm, D2bs, d2bm, d2bs, D2s, d2s, D1m, d1m, d1s, EP01, EP12, CP2, CP2b, CP3, CP3b, and EP03 are indicated 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.

[0080] 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.

[0081] It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3; and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3. In the three examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses of the optical imaging device from the first lens to the seventh lens, as well as the coefficients of higher-order terms are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the sixth spacing element, and the shapes of some lenses are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0082] It should be noted that any one of the following embodiments 1 to 3 is applicable to all embodiments of the present application.

[0083] Embodiment 1

[0084] like Figures 2 to 7 As shown, the optical imaging device of embodiment 1 is described. Figure 2 shows a schematic structural diagram of the optical imaging device of Example 1-1, Figure 3 A schematic diagram of the structure of the optical imaging device of Embodiment 1-2 is shown, Figure 4 A schematic structural diagram of the optical imaging device of Examples 1-3 is shown.

[0085] like Figures 2 to 4 As shown, the optical imaging device includes a lens barrel P0 and 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 third auxiliary spacing element P3b, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6 and a seventh lens E7 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The lens barrel P0 has an object side end face 10, an image side end face 20, an outer annular surface 30 and an inner annular surface 40. The object side end face 10 and the image side end face 20 are both arranged perpendicular to the optical axis, and the object side end face 10, the inner annular surface 40, the image side end face 20 and the outer annular surface 30 are sequentially connected end to end.

[0086] like Figure 2As shown, it is a structural schematic diagram of the optical imaging device of Example 1-1. In this example, the object side surface and image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element P3b, and the image side surface of the third auxiliary spacer element P3b is respectively in contact with the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and image side surface of the fifth spacer element P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens. The object side surface and image side surface of the sixth spacer element P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens.

[0087] like Figure 3 , which is a schematic diagram of the structure of the optical imaging device of Example 1-2. In this example, the spacer element group further includes a second auxiliary spacer element P2b, which is located between the second spacer element P2 and the third lens E3, and the object side surface and image side surface of the second auxiliary spacer element P2b are respectively abutted against the image side surface of the second spacer element P2 and the object side surface S5 of the third lens, and the abutting manner of the remaining spacer elements is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0088] like Figure 4 The figure is a schematic diagram of the structure of the optical imaging device of Example 1-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-2. Please refer to the relevant description in Example 1-2, and no further description is given here. In summary, the structural parameters of the optical imaging device of Example 1 under Example 1-1, Example 1-2 and Example 1-3 are shown in Table 2. (Unit: mm)

[0089] Table 2

[0090]

[0091] In Embodiment 1, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a convex surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0092] In Example 1, the total effective focal length f of the optical imaging device is 2.13 mm, the relative aperture FNO of the optical imaging device is 1.19, the effective focal length f1 of the first lens is -7.72 mm, the effective focal length f2 of the second lens is -11.03 mm, the effective focal length f3 of the third lens is 8.79 mm, the effective focal length f4 of the fourth lens is 2.92 mm, the effective focal length f5 of the fifth lens is -3.62 mm, the effective focal length f6 of the sixth lens is 4.35 mm, the effective focal length f7 of the seventh lens is -5.69 mm, and the maximum semi-field angle Semi-FOV of the optical imaging device is 88.40°.

[0093] Table 3 shows the basic structural parameters of the optical imaging device of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0094] Table 3

[0095]

[0096] In Embodiment 1, the object-side surface and the image-side surface of the second lens E2 to the seventh lens E7 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0097] Formula (1)

[0098] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface S3-S14 in Example 1.

[0099] Table 4

[0100]

[0101] Figure 5 The 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.

[0102] 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.

[0103] Embodiment 2

[0104] like Figures 8 to 13 As shown, the optical imaging device of the second embodiment is described. Figure 8 A schematic structural diagram of the optical imaging device of Example 2-1 is shown, Fig. 9 A schematic structural diagram of an optical imaging device of Example 2-2 is shown, Fig.10 A schematic structural diagram of the optical imaging device of Example 2-3 is shown.

[0105] like Figures 8 to 10 As shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a second auxiliary spacing element P2b, a third lens E3, a third spacing element P3, a third auxiliary spacing element P3b, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6 and a seventh lens E7 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The lens barrel P0 has an object side end surface 10, an image side end surface 20, an outer annular surface 30 and an inner annular surface 40.

[0106] like Figure 8As shown, it is a structural schematic diagram of the optical imaging device of Example 2-1. In this example, the object side surface and image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, and the image side surface of the second auxiliary spacer element P2b is respectively in contact with the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element P3b, and the image side surface of the third auxiliary spacer element P3b is respectively in contact with the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and image side surface of the fifth spacer element P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens. The object-side surface and the image-side surface of the sixth spacer P6 partially abut against the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0107] like Fig. 9 , which is a schematic diagram of the structure of the optical imaging device of Example 2-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0108] like Fig.10 , which is a schematic diagram of the structure of the optical imaging device of Example 2-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0109] In summary, the structural parameters of the optical imaging device of the second embodiment in the embodiments 2-1, 2-2 and 2-3 are shown in Table 5. (Unit: mm)

[0110] Table 5

[0111]

[0112] In Embodiment 2, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a convex surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0113] In Example 2, the total effective focal length f of the optical imaging device is 2.14 mm, the relative aperture FNO of the optical imaging device is 1.19, the effective focal length f1 of the first lens is -7.71 mm, the effective focal length f2 of the second lens is -10.66 mm, the effective focal length f3 of the third lens is 7.02 mm, the effective focal length f4 of the fourth lens is 3.89 mm, the effective focal length f5 of the fifth lens is -3.98 mm, the effective focal length f6 of the sixth lens is 3.84 mm, the effective focal length f7 of the seventh lens is -7.73 mm, and the maximum semi-field angle Semi-FOV of the optical imaging device is 78.30°.

[0114] Table 6 shows the basic structural parameters of the optical imaging device of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0115] Table 6

[0116]

[0117] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S3-S14 in Example 2.

[0118] Table 7

[0119]

[0120] Fig.11 The axial chromatic aberration curve of the optical imaging device of the second 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 the second embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.13 The distortion curve of the optical imaging device of the second embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field of view angles.

[0121] according to Figures 11 to 13 It can be seen that the optical imaging device provided in the second embodiment can achieve good imaging quality.

[0122] Embodiment 3

[0123] like Figures 14 to 19 As shown, the optical imaging device of embodiment three is described. Fig.14 A schematic diagram of the structure of the optical imaging device of Example 3-1 is shown, Fig.15 A schematic diagram of the structure of the optical imaging device of Example 3-2 is shown, Fig.16 A schematic structural diagram of the optical imaging device of Example 3-3 is shown.

[0124] like Figures 14 to 16 As shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a second auxiliary spacing element P2b, a third lens E3, a third spacing element P3, a third auxiliary spacing element P3b, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6 and a seventh lens E7 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The lens barrel P0 has an object side end surface 10, an image side end surface 20, an outer annular surface 30 and an inner annular surface 40.

[0125] like Fig.14 As shown, it is a structural schematic diagram of the optical imaging device of Example 3-1. In this example, the spacer element also includes a sixth auxiliary spacer element P6b, the sixth auxiliary spacer element P6b is located between the sixth spacer element P6 and the seventh lens E7, and the object side surface and image side surface of the sixth auxiliary spacer element P6b are respectively abutted with the image side surface of the sixth spacer element P6 and the object side surface S13 of the seventh lens. In addition, the object side surface and image side surface of the first spacer element P1 are respectively abutted with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively abutted with the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, and the image side surface of the second auxiliary spacer element P2b is partially abutted with the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively abutted with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element P3b, and the image side surface of the third auxiliary spacer element P3b is partially abutted with the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and image side surface of the fifth spacer element P5 partially abut the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively.

[0126] like Fig.15 , which is a schematic diagram of the structure of the optical imaging device of Example 3-2. The difference between this example and Example 3-1 is that the sixth auxiliary spacer element P6b is not provided. Therefore, the object side surface and the image side surface of the sixth spacer element P6 are respectively abutted against the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens. The abutment manner of the remaining spacer elements is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and no further description is given here.

[0127] like Fig.16, which is a schematic diagram of the structure of the optical imaging device of Example 3-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-2, and the relevant description in Example 3-2 may be referred to, and will not be repeated here.

[0128] In summary, the structural parameters of the optical imaging device of the third embodiment in the embodiments 3-1, 3-2 and 3-3 are shown in Table 8. (Unit: mm)

[0129] Table 8

[0130]

[0131] In Embodiment 3, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a convex surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0132] In Example 3, the total effective focal length f of the optical imaging device is 1.88 mm, the relative aperture FNO of the optical imaging device is 1.19, the effective focal length f1 of the first lens is -7.44 mm, the effective focal length f2 of the second lens is -8.22 mm, the effective focal length f3 of the third lens is 5.70 mm, the effective focal length f4 of the fourth lens is 4.21 mm, the effective focal length f5 of the fifth lens is -3.91 mm, the effective focal length f6 of the sixth lens is 4.14 mm, the effective focal length f7 of the seventh lens is -10.37 mm, and the maximum half field of view Semi-FOV of the optical imaging device is 90.80°.

[0133] Table 9 shows the basic structural parameter table of the optical imaging device of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0134] Table 9

[0135]

[0136] Table 10 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirror surfaces S3-S14 in Example 3.

[0137] Table 10

[0138]

[0139] Fig.17 The axial chromatic aberration curve of the optical imaging device of the third embodiment is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging device. Fig.18 The astigmatism curve of the optical imaging device of the third embodiment 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 the third embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field of view angles.

[0140] according to Figures 17 to 19 It can be seen that the optical imaging device provided in the third embodiment can achieve good imaging quality.

[0141] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0142] Table 11

[0143]

[0144] Table 12 shows the effective focal lengths of the lenses of the optical imaging devices of Examples 1 to 3.

[0145] Table 12

[0146]

[0147] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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 lens barrel comprises a lens group and a spacer element group assembled in the lens barrel. The lens barrel has an object side end surface, an image side end surface, an outer annular surface and an inner annular surface, and the inner annular surface is in a stepped shape; The lens group is composed of seven lenses, and the seven lenses are, from the object side to the image side, in order: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power; there is an air gap between two adjacent lenses from the first lens to the seventh lens; the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is convex, and the image side surface is concave; the object side surface of the sixth lens is convex, and the image side surface is convex; the object side surface of the seventh lens is convex, and the image side surface is concave; The spacer element group includes a first spacer element disposed 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 disposed 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 disposed 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 disposed 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 disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; The maximum semi-field angle Semi-FOV of the optical imaging device meets the following requirements: 78° <Semi-FOV<91°; The effective diameter DT11 of the light-transmitting portion of the first lens on the object side and the effective diameter DT12 of the light-transmitting portion of the first lens on the image side satisfy: 1.7 <DT11 / DT12<2.1; 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 axial distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacing element satisfy the following: 2.45<(d0s-d1s) / EP01≤3.

15.

2. The optical imaging device according to claim 1, characterized in that: An inner diameter d1s of the object side surface of the first spacer element, an inner diameter d2s of the object side surface of the second spacer element, and an effective focal length f2 of the second lens satisfy: -0.23≤(d1s-d2s) / f2≤0.

21.

3. The optical imaging device according to claim 1, characterized in that: The inner diameter d1m of the image side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, and the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens satisfy: 1.8<(D1m-d1m) / T12<5.

4.

4. The optical imaging device according to claim 1, characterized in that: The on-axis distance T12 from the image side surface of the first lens to the object side surface of the second lens, the on-axis distance T23 from the image side surface of the second lens to the object side surface of the third lens, and the effective focal length f2 of the second lens satisfy: -0.55 < (T12 + T23) / f2 < -0.

3.

5. The optical imaging device according to claim 1, characterized in that: The on-axis distance T23 from the image side surface of the second lens to the object side surface of the third lens, the on-axis distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element, and the on-axis distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element satisfy: 0.6 < (EP12 + EP23) / T23 < 1.

85.

6. The optical imaging device according to claim 1, characterized in that: The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: -0.8 ≤ (f1 - f2) / f12 < -0.

2.

7. The optical imaging device according to claim 1, characterized in that: The inner diameter d2s of the object side surface of the second spacer element, the outer diameter D2s of the object side surface of the second spacer element, and the effective image side diameter DT22 of the light transmissive portion of the second lens satisfy: 0.55 < (D2s - d2s) / DT22 < 2.

9.

8. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a second auxiliary spacer element, which is located between the second spacer element and the third lens, and its image side surface is in partial contact with the object side surface of the third lens. The central thickness CP2 of the second spacer element, the central thickness CP2b of the second auxiliary spacer element, and the on-axis distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: 0 < (CP2 + CP2b) / EP12 < 1.

1.

9. The optical imaging device according to claim 8, characterized in that: The outer diameter D2bm of the image side surface of the second auxiliary spacer element, the outer diameter D2bs of the object side surface of the second auxiliary spacer element, the inner diameter d2bm of the image side surface of the second auxiliary spacer element, and the inner diameter d2bs of the object side surface of the second auxiliary spacer element satisfy: 1 ≤ (D2bm - d2bm) / (D2bs - d2bs) ≤ 1.

5.

10. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a second auxiliary spacer element, which is located between the second spacer element and the third lens, and its image side surface is in partial contact with the object side surface of the third lens. The inner diameter d2bm of the image side surface of the second auxiliary spacer element and the effective focal length f3 of the third lens satisfy: 0.4 < d2bm / f3 < 1.1; the inner diameter d2s of the object side surface of the second spacer element and the effective focal length f2 of the second lens satisfy: -0.75 < d2s / f2 < -0.

30.

11. The optical imaging device according to claim 1, characterized in that: The on-axis distance EP03 from the object side end surface of the lens barrel to 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: -0.15 ≤ EP03 / f123 ≤ 0.

7.

12. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third auxiliary spacer element, which is located between the third spacer element and the fourth lens, and its image side is in partial contact with the object side of the fourth lens. The following condition is satisfied among the central thickness CP3 of the third spacer element, the central thickness CP3b of the third auxiliary spacer element, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens: 0.29 < (CP3 + CP3b) / (CT3 + CT4) ≤ 0.

55.

13. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third auxiliary spacer element, which is located between the third spacer element and the fourth lens, and its image side is in partial contact with the object side of the fourth lens. The following condition is satisfied between the inner diameter d3bs of the object side of the third auxiliary spacer element and the inner diameter d3s of the object side of the third spacer element: 0.55 ≤ d3s / d3bs < 1.

65.

14. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third auxiliary spacer element, which is located between the third spacer element and the fourth lens, and its image side is in partial contact with the object side of the fourth lens. The following conditions are satisfied: between the inner diameter d3s of the object side of the third spacer element and the curvature radius R6 of the image side of the third lens: -2.55 < d3s / R6 < -0.6; between the inner diameter d3bm of the image side of the third auxiliary spacer element and the curvature radius R7 of the object side of the fourth lens: 0.32 < d3bm / R7 < 1.90.

Images