Image forming apparatus

Abstract

The invention provides an image forming apparatus. The imaging device comprises a lens barrel, a lens group and a spacing element group, and the lens group and the spacing element group are arranged in the lens barrel. The seven lenses are a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with focal power, a sixth lens with focal power and a seventh lens with focal power; the spacing element group comprises a first spacing element, a second spacing element, a third spacing element, a fourth spacing element, a fifth spacing element and a sixth spacing element; the following conditions are satisfied: 2.6 lt; f < no > * TAN (Semi-FOV) < lt >; 5.8); the following conditions are satisfied: 0.4 lt; (D0s-d0m) / Llt; and 0.67. The problem that stray light is serious due to the fact that an imaging device with seven lenses in the prior art meets the requirements for the ultra-wide angle and the large aperture is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an imaging device. Background Art

[0002] In modern electronic products, the imaging quality of imaging devices has become one of the key factors for users to choose. With the advancement of technology, users have higher and higher performance requirements for imaging devices, especially in terms of ultra-wide angle and large aperture. Meeting the ultra-wide angle enables the imaging device to provide a wider field of view, while meeting the large aperture can capture more light and improve the brightness and clarity of the image. However, these technological advances have brought new challenges, especially in the control of stray light.

[0003] At present, the imaging device composed of seven lenses that meet the requirements of ultra-wide angle and large aperture has a particularly serious stray light problem because a large amount of light enters it and is constantly refracted between the lenses. This stray light has a negative impact on normal optical path imaging and reduces the imaging quality.

[0004] That is to say, the imaging device with seven lenses in the prior art has the problem of serious stray light in order to meet the requirements of ultra-wide angle and large aperture. Summary of the invention

[0005] The main purpose of the present invention is to provide an imaging device to solve the problem that the imaging device with seven lenses in the prior art has serious stray light caused by meeting the requirements of ultra-wide angle and large aperture.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an imaging device, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an inner annular surface and an outer annular surface, and the inner annular surface is stepped; the lens group includes 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 an optical power, a sixth lens with an optical power, and a seventh lens with an optical power. There is an air gap between two adjacent lenses among 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 second lens is concave; the object-side surface of the third lens is convex; the image-side surface of the fourth lens is convex; the image-side surface of the fifth lens is concave; the object-side surface of the seventh lens is convex; the spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image-side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial contact with the image-side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in partial contact with the image-side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in partial contact with the image-side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in partial 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 in partial contact with the image-side surface of the sixth lens; the aperture value fno of the imaging device and the maximum semi-field angle Semi-FOV of the imaging device satisfy: 2.6 < fno × TAN(Semi-FOV) < 5.8; the outer 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 maximum axial height L from the object-side end face to the image-side end face of the lens barrel satisfy: 0.4 < (D0s - d0m) / L < 0.67.

[0007] According to another aspect of the present invention, there is provided an imaging device including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an inner annular surface and an outer annular surface, and the inner annular surface is stepped; the lens group includes 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 an optical power, a sixth lens with an optical power, and a seventh lens with an optical power. 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 disposed between the first lens and the second lens and in partial contact with the image-side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial contact with the image-side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in partial contact with the image-side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in partial contact with the image-side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in partial 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 in partial contact with the image-side surface of the sixth lens; the aperture value fno of the imaging device and the maximum semi-field angle Semi-FOV of the imaging device satisfy: 2.6 < fno × TAN(Semi-FOV) < 5.8; the image-side outer diameter D6m of the sixth spacer element, the image-side inner diameter d6m of the sixth spacer element and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens satisfy: 1.1 < (D6m - d6m) / DT71 < 2.9.

[0008] According to another aspect of the present invention, there is provided an imaging device, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an inner annular face, and an outer annular face, and the inner annular face is stepped; the lens group includes 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 an optical power, a sixth lens with an optical power, and a seventh lens with an optical power. 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 disposed between the first lens and the second lens and in partial contact with the image-side face of the first lens, a second spacer element disposed between the second lens and the third lens and in partial contact with the image-side face of the second lens, a third spacer element disposed between the third lens and the fourth lens and in partial contact with the image-side face of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in partial contact with the image-side face of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in partial contact with the image-side face of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in partial contact with the image-side face of the sixth lens; the object-side inner diameter d5s of the fifth spacer element and the entrance pupil diameter EPD of the imaging device satisfy: 2.2 < d5s / EPD < 3.0; the image-side outer diameter D6m of the sixth spacer element, the image-side inner diameter d6m of the sixth spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 1.0 < (D6m - d6m) / (CT6 + CT7) < 3.35.

[0009] Further, the inner diameter d0m of the image-side end face of the lens barrel and the entrance pupil diameter EPD of the imaging device satisfy: 3.4 ≤ d0m / EPD < 4.25.

[0010] Further, the maximum axial height L from the object-side end face to the image-side end face of the lens barrel and the effective focal length f of the imaging device satisfy: 5.5 < L / f < 6.6.

[0011] Further, the refractive indices of the fourth lens to the seventh lens change in a pattern of low, high, low, high.

[0012] Further, the refractive index of the fourth lens is equal to the refractive index of the sixth lens, and the refractive index of the fifth lens is equal to the refractive index of the seventh lens.

[0013] Further, the object-side outer diameter D4s of the fourth spacer element and the object-side inner diameter d4s of the fourth spacer element satisfy: 1.2 < D4s / d4s < 2.4.

[0014] Further, the following conditions are satisfied between the object-side inner diameter d4s of the fourth spacer element and the image-side effective radius DT42 of the light-transmitting portion of the fourth lens: 1.85 < d4s / DT42 < 2.65; the following conditions are satisfied between the image-side inner diameter d4m of the fourth spacer element and the object-side effective radius DT51 of the light-transmitting portion of the fifth lens: 1.90 < d4m / DT51 < 2.20.

[0015] Further, the following conditions are satisfied between the curvature radius R8 of the image-side surface of the fourth lens and the curvature radius R9 of the object-side surface of the fifth lens: -1.3 < R8 / R9 < 0.6.

[0016] Further, when both the curvature radius R7 of the object-side surface of the fourth lens and the curvature radius R8 of the image-side surface of the fourth lens are negative values, the spacer element group further includes a fourth auxiliary spacer element. The fourth auxiliary spacer element is located between the fourth spacer element and the fifth lens, and the image-side surface of the fourth auxiliary spacer element is in partial contact with the object-side surface of the fifth lens. The following conditions are satisfied among the object-side outer diameter D4bs, the object-side inner diameter d4bs of the fourth auxiliary spacer element, and the central thickness CP4 of the fourth spacer element: 1.6 < (D4bs - d4bs) / CP4 < 2.5.

[0017] Further, the following conditions are satisfied among the object-side inner diameter d5s of the fifth spacer element, the image-side inner diameter d4m of the fourth spacer element, and the effective focal length f5 of the fifth lens: -0.2 < (d5s - d4m) / f5 < 0.15.

[0018] Further, the following conditions are satisfied between the object-side outer diameter D5s and the object-side inner diameter d5s of the fifth spacer element: 1.55 < D5s / d5s ≤ 2.40; the following conditions are satisfied between the object-side outer diameter D6s and the object-side inner diameter d6s of the sixth spacer element: 1.50 < D6s / d6s < 2.55.

[0019] Further, the following conditions are satisfied among the image-side outer diameter D6m, the image-side inner diameter d6m of the sixth spacer element, and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens: 1.1 < (D6m - d6m) / DT71 < 2.9.

[0020] Further, the following conditions are satisfied between the inner diameter d0m of the image-side end surface of the lens barrel and the image-side effective radius DT72 of the light-transmitting portion of the seventh lens: 2.5 < d0m / DT72 < 2.9; the following conditions are satisfied between the image-side inner diameter d6m of the sixth spacer element and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens: 1.85 ≤ d6m / DT71 < 2.15.

[0021] Further, the following conditions are satisfied between the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the imaging device: 1.5 < f4567 / f ≤ 2.4.

[0022] Applying the technical solution of the present invention, the imaging device of the present application is composed of a lens barrel and seven lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the positions of the seven lenses and the plurality of spacer elements and setting the imaging device to satisfy 2.6 < fno × TAN(Semi-FOV) < 5.8, the angle of light entering the lens can be adjusted, so that the imaging device composed of seven lenses can simultaneously meet the parameter requirements of ultra-wide angle and large aperture. However, in this case, the excessive angle requirements and apertures cause a large amount of light to enter the imaging device, and the light is continuously refracted between the lenses, resulting in a relatively serious stray light problem, thereby affecting the overall performance of the imaging device. Therefore, the present application restricts 0.4 < (D0s - d0m) / L < 0.67, strictly controls the front-back end difference and height ratio of the lens barrel within a certain range, and ensures that the tail end of the lens barrel is lower than the front end, so as to ensure that the stray light is intercepted at the tail end of the lens barrel, thereby preventing the stray light from entering the imaging surface, reducing the influence of the stray light on the imaging quality, and improving the overall imaging performance of the imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specification drawings forming a part of the present 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 imaging device of an alternative embodiment of the present invention is shown;

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

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

[0027] Figure 4 The schematic structural diagram of the imaging device of 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 imaging device of Embodiment 1 of the present invention are respectively shown;

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

[0030] Fig. 9 The schematic structural diagram of the imaging device of Embodiment 2-2 of the present invention is shown;

[0031] Fig.10 The schematic structural diagram of the imaging device of 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 imaging device of the second embodiment of the present invention are respectively shown;

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

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

[0035] Fig.16 A schematic structural diagram of an 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 imaging device of the third embodiment of the present invention are respectively shown;

[0037] Fig. 20 and Fig.21 The MTF curve diagram and stray light diagram are respectively shown when the imaging device of an optional embodiment of the present invention satisfies fno×TAN(Semi-FOV)=5.75, (D0s-d0m) / L=0.75;

[0038] Fig. 22 and Fig.23 The MTF curve diagram and stray light diagram are respectively shown when the imaging device of an optional embodiment of the present invention satisfies fno×TAN(Semi-FOV)=5.75, (D0s-d0m) / L=0.64;

[0039] Fig.24 and Fig.25 The MTF curve diagram and stray light diagram are respectively shown when the imaging device of an optional embodiment of the present invention satisfies fno×TAN(Semi-FOV)=5.75 and (D0s-d0m) / L=0.35.

[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 spacing element; P2, second spacing element; P3, third spacing element; P4, fourth spacing element; P5, fifth spacing element; P6, sixth spacing element. 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 convexity and concavity. 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 the present 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 imaging device with seven lenses in the prior art has serious stray light due to the requirement of ultra-wide angle and large aperture, the present invention provides an imaging device.

[0049] like Figures 1 to 25As shown in the figure, in an alternative embodiment of the present application, the imaging device includes a lens barrel, a lens group, and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an inner annular surface, and an outer annular surface, and the inner annular surface is stepped; the lens group includes seven lenses. 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 an optical power, a sixth lens with an optical power, and a seventh lens with an optical power. There is an air gap between two adjacent lenses among 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 second lens is concave; the object side surface of the third lens is convex; the image side surface of the fourth lens is convex; the image side surface of the fifth lens is concave; the object side surface of the seventh lens is convex; the spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in partial contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in partial contact with the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in partial 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 in partial contact with the image side surface of the sixth lens; the aperture value fno of the imaging device and the maximum semi-field angle Semi-FOV of the imaging device satisfy: 2.6 < fno × TAN(Semi-FOV) < 5.8; the outer 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 maximum axial height L from the object-side end face to the image-side end face of the lens barrel satisfy: 0.4 < (D0s - d0m) / L < 0.67.

[0050] The imaging device of the present application is composed of a lens barrel, seven lenses, and multiple spacer elements disposed in the lens barrel. By reasonably arranging the positions of the seven lenses and multiple spacer elements and setting the imaging device to satisfy 2.6 < fno × TAN(Semi-FOV) < 5.8, the angle at which light enters the lens can be adjusted, so that the imaging device composed of seven lenses can simultaneously meet the parameter requirements of ultra-wide angle and large aperture. However, in this case, the excessive angle requirement and aperture cause a large amount of light to enter the imaging device, and the light is continuously refracted between the lenses, bringing a relatively serious stray light problem, thereby affecting the overall performance of the imaging device. Therefore, in the present application, by restricting 0.4 < (D0s - d0m) / L < 0.67 and strictly controlling the front-back end difference and height ratio of the lens barrel within a certain range to ensure that the tail end of the lens barrel is lower than the front end, it can be ensured that the stray light is intercepted at the tail end of the lens barrel, thereby preventing the stray light from entering the imaging surface, reducing the influence of the stray light on the imaging quality, and improving the overall imaging performance of the imaging device.

[0051] It should be noted that each lens is composed 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 around the circumference of the light-transmitting portion, and the light-transmitting portion and the supporting portion are connected and integrally formed. 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 or the adjacent lens or the adjacent spacing element.

[0052] In addition, refer to Table 1 and Figure 20 to Figure 25 As shown, under the premise that the imaging device satisfies fno×TAN(Semi-FOV)=5.75, Fig. 20 and Fig.21 The MTF curve and stray light diagram are shown respectively when the imaging device satisfies (D0s-d0m) / L=0.75. Fig. 22 and Fig.23 The MTF curve and stray light diagram are shown respectively when the imaging device satisfies (D0s-d0m) / L=0.64. Fig.24 and Fig.25 The MTF curve diagram and the stray light diagram are respectively shown when the imaging device satisfies (D0s-d0m) / L=0.35.

[0053] Depend on Figure 20 to Figure 25 It can be seen that when (D0s-d0m) / L=0.75 is satisfied, the difference between the front and rear ends of the lens barrel is too large, and the total length of the imaging device is too short, making the light path steeper, part of the field of view peak of the MTF curve drops, and the stray light is also more obvious, the MTF curve graph and the stray light graph are poor, and the optical system is compressed, affecting the performance of the imaging device. When (D0s-d0m) / L=0.35 is satisfied, the difference between the front and rear ends of the lens barrel is too small, and the total length of the imaging device is too long, which will cause the stray light at the tail end to not be well intercepted, the stray light is more obvious, and the field of view peak in the middle of the MTF curve drops, the performance is poor, and the performance of the imaging device is reduced. When (D0s-d0m) / L=0.64 is satisfied, the stray light is intercepted at the tail end of the lens barrel, reducing the stray light, and at the same time making the contrast transmission performance of the MTF curve higher and better. It can be seen that when (D0s-d0m) / L is in the range of 0.4 to 0.67, it can ensure that the tail end of the lens barrel is lower than the front end, and the stray light can be intercepted at the tail end of the lens barrel, thereby preventing the stray light from entering the imaging surface, reducing the influence of the stray light on the imaging quality, and improving the overall imaging performance of the imaging device.

[0054] Example 1 Example 2 Example 3 (D0s-d0m) / L 0.75 0.64 0.35 performance Fig. 20 Fig. 22 Fig.24 Stray light image Fig.21 Fig.23 Fig.25

[0055] Table 1

[0056] In this embodiment, the inner diameter d0m of the image-side end face of the lens barrel and the entrance pupil diameter EPD of the imaging device satisfy: 3.4 ≤ d0m / EPD < 4.25. By controlling the inner diameter of the image-side end face of the lens barrel, the light passing amount of the outgoing light can be controlled. By controlling the entrance pupil diameter, the effective aperture of the incident light can be controlled. By controlling the ratio of the two, the ratio of the incident light to the outgoing light can be controlled, and further the ratio of the object to the imaging can be controlled, so as to control the optical performance of the imaging device to meet the design requirements.

[0057] In this embodiment, the maximum axial height L from the object-side end face to the image-side end face of the lens barrel and the effective focal length f of the imaging device satisfy: 5.5 < L / f < 6.6. By controlling the ratio of the maximum height from the object-side end face to the image-side end face of the lens barrel to the effective focal length of the imaging device, the imaging position can be controlled while controlling the imaging size of the imaging device.

[0058] In this embodiment, the refractive indices of the fourth lens to the seventh lens change in the pattern of low, high, low, high. Specifically, the low and high here refer to the refractive indices of two adjacent lenses. The refractive index of the fourth lens is less than that of the fifth lens, the refractive index of the fifth lens is greater than that of the sixth lens, and the refractive index of the sixth lens is less than that of the seventh lens. Through the combination of low, high, low, and high refractive indices, the size of the lens can be appropriately adjusted, which is beneficial to improving the assembly performance and imaging quality, can effectively improve the field curvature, and enhance the overall performance of the imaging device.

[0059] In this embodiment, the refractive index of the fourth lens is equal to that of the sixth lens, and the refractive index of the fifth lens is equal to that of the seventh lens. The refractive index represents the refraction ability of the lens. By controlling the equal refractive indices of the fourth lens and the sixth lens, and the fifth lens and the seventh lens, the chromatic aberration of the lens can be balanced and the imaging quality can be improved.

[0060] In this embodiment, the object-side outer diameter D4s and the object-side inner diameter d4s of the fourth spacer element satisfy: 1.2 < D4s / d4s < 2.4. By controlling the object-side inner diameter of the fourth spacer element, the light passing amount through the fourth spacer element can be controlled, and the generation of stray light can be improved. By controlling the object-side outer diameter of the fourth spacer element, the size of the fourth spacer element can be controlled. By controlling the ratio of the two, the light passing amount can be controlled while restricting the size of the imaging device.

[0061] In this embodiment, the following conditions are satisfied between the object-side inner diameter d4s of the fourth spacer element and the image-side effective radius DT42 of the light-transmitting portion of the fourth lens: 1.85 < d4s / DT42 < 2.65; and the following conditions are satisfied between the image-side inner diameter d4m of the fourth spacer element and the object-side effective radius DT51 of the light-transmitting portion of the fifth lens: 1.90 < d4m / DT51 < 2.20. By controlling these two conditional expressions, the effective light-transmitting amount entering the fourth lens and the fifth lens is controlled, thereby avoiding the generation of stray light.

[0062] In this embodiment, the following conditions are satisfied between the curvature radius R8 of the image-side surface of the fourth lens and the curvature radius R9 of the object-side surface of the fifth lens: -1.3 < R8 / R9 < 0.6. The curvature radius reflects the degree of bending of the lens. By controlling the ratio of the curvature radii of the fourth lens and the fifth lens, the shapes of the two lenses are improved, the visual effect of the lens is enhanced, and thus the optical performance of the lens is enhanced.

[0063] In this embodiment, when both the curvature radius R7 of the object-side surface of the fourth lens and the curvature radius R8 of the image-side surface of the fourth lens are negative values, the spacer element group further includes a fourth auxiliary spacer element. The fourth auxiliary spacer element is located between the fourth spacer element and the fifth lens, and the image-side surface of the fourth auxiliary spacer element is in partial contact with the object-side surface of the fifth lens. The following conditions are satisfied between the object-side outer diameter D4bs, the object-side inner diameter d4bs of the fourth auxiliary spacer element, and the central thickness CP4 of the fourth spacer element: 1.6 < (D4bs - d4bs) / CP4 < 2.5. By controlling the ratio of the difference between the object-side outer and inner diameters of the fourth auxiliary spacer element to the central thickness of the fourth spacer element, while controlling the number of light rays passing through the fourth spacer element, the size and thickness of the fourth spacer element are controlled, and while avoiding the generation of stray light, the overall lens structure is optimized.

[0064] In this embodiment, the following conditions are satisfied between the object-side inner diameter d5s of the fifth spacer element, the image-side inner diameter d4m of the fourth spacer element, and the effective focal length f5 of the fifth lens: -0.2 < (d5s - d4m) / f5 < 0.15. By controlling the ratio of the difference between the object-side inner diameter of the fifth spacer element and the image-side inner diameter of the fourth spacer element to the effective focal length of the fifth lens, while controlling the light ray trajectory passing through the fifth lens, the size of the lens imaging can be controlled, and the overall quality of the imaging device can be enhanced.

[0065] In this embodiment, the following conditions are satisfied between the object-side outer diameter D5s and the object-side inner diameter d5s of the fifth spacer element: 1.55 < D5s / d5s ≤ 2.40; and the following conditions are satisfied between the object-side outer diameter D6s and the object-side inner diameter d6s of the sixth spacer element: 1.50 < D6s / d6s < 2.55. By controlling these two conditional expressions, the number of light rays entering the sixth lens and the seventh lens can be controlled, thereby avoiding the generation of stray light.

[0066] In this embodiment, the following relationship is satisfied among the image-side outer diameter D6m of the sixth spacer element, the image-side inner diameter d6m of the sixth spacer element, and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens: 1.1 < (D6m - d6m) / DT71 < 2.9. By controlling the difference between the image-side outer diameter and the image-side inner diameter of the sixth spacer element, the size of the sixth spacer element and the number of light rays entering the seventh lens can be controlled. By the ratio of the difference to the object-side effective diameter of the light-transmitting portion of the seventh lens, the effective light path passing through the seventh lens and the overall ratio of the seventh lens can be adjusted, which has certain advantages in avoiding the generation of stray light and improving the overall structure.

[0067] In this embodiment, the following relationship is satisfied between the inner diameter d0m of the image-side end face of the lens barrel and the image-side effective radius DT72 of the light-transmitting portion of the seventh lens: 2.5 < d0m / DT72 < 2.9; the following relationship is satisfied between the image-side inner diameter d6m of the sixth spacer element and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens: 1.85 ≤ d6m / DT71 < 2.15. By controlling these two conditional expressions, while controlling the number and path of light rays passing through the seventh lens by the sixth lens, the overall size of the imaging device is controlled, and the generation of stray light and the overall performance are improved.

[0068] In this embodiment, the following relationship is satisfied between the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the imaging device: 1.5 < f4567 / f ≤ 2.4. The combined focal length reflects the imaging size from the fourth lens to the seventh lens. By controlling the ratio of the combined focal length to the effective focal length of the imaging device, the convergence of light rays is controlled, thereby improving the performance of the imaging device and the quality of imaging.

[0069] Optionally, the 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 software and / or tools such as the 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 imaging device is further provided, which includes a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an inner ring face and an outer ring face, and the inner ring face is stepped; the lens group includes 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 an optical power, a sixth lens with an optical power, and a seventh lens with an optical power. 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 disposed between the first lens and the second lens and in partial contact with the image-side face of the first lens, a second spacer element disposed between the second lens and the third lens and in partial contact with the image-side face of the second lens, a third spacer element disposed between the third lens and the fourth lens and in partial contact with the image-side face of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in partial contact with the image-side face of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in partial contact with the image-side face of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in partial contact with the image-side face of the sixth lens; the aperture value fno of the imaging device and the maximum half field of view Semi-FOV of the imaging device satisfy: 2.6 < fno × TAN(Semi-FOV) < 5.8; the image-side outer diameter D6m of the sixth spacer element, the image-side inner diameter d6m of the sixth spacer element, and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens satisfy: 1.1 < (D6m - d6m) / DT71 < 2.9.

[0071] The imaging device of the present application is composed of a lens barrel, seven lenses and a plurality of spacer elements disposed in the lens barrel. By reasonably arranging the optical powers of the seven lenses, the positions of the plurality of spacer elements and setting the imaging device to satisfy 2.6 < fno × TAN(Semi-FOV) < 5.8, the angle at which light enters the lens can be adjusted, so that the imaging device composed of seven lenses can simultaneously meet the parameter requirements of ultra-wide angle and large aperture. However, in this case, the excessive angle requirement and aperture cause a large amount of light to enter the imaging device, and the continuous refraction of light between the lenses brings a relatively serious stray light problem. Therefore, in the present application, by restricting 1.1 < (D6m - d6m) / DT71 < 2.9, by controlling the difference between the image-side outer diameter and the image-side inner diameter of the sixth spacer element, the size of the sixth spacer element and the amount of light entering the seventh lens can be controlled. By the ratio of the difference to the object-side effective diameter of the light-transmitting portion of the seventh lens, the effective light path passing through the seventh lens and the overall ratio of the seventh lens can be adjusted, which has certain advantages for avoiding the generation of stray light and improving the overall structure.

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

[0073] In addition, in another optional embodiment of the present application, an imaging device is further provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an inner ring face and an outer ring face, and the inner ring face is stepped; the lens group includes seven lenses, and the seven lenses are, in order from the object side to the image side, a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a focal power, a sixth lens with a focal power, and a seventh lens with a focal power. 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 disposed between the first lens and the second lens and in partial contact with the image-side face of the first lens, a second spacer element disposed between the second lens and the third lens and in partial contact with the image-side face of the second lens, a third spacer element disposed between the third lens and the fourth lens and in partial contact with the image-side face of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in partial contact with the image-side face of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in partial contact with the image-side face of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in partial contact with the image-side face of the sixth lens; the object-side inner diameter d5s of the fifth spacer element and the entrance pupil diameter EPD of the imaging device satisfy: 2.2 < d5s / EPD < 3.0; the image-side outer diameter D6m of the sixth spacer element, the image-side inner diameter d6m of the sixth spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 1.0 < (D6m - d6m) / (CT6 + CT7) < 3.35.

[0074] The imaging device of the present application is composed of a lens barrel and seven lenses and multiple spacer elements disposed in the lens barrel. By reasonably arranging the focal powers of the seven lenses, the positions of the multiple spacer elements, and setting the imaging device to satisfy 2.2 < d5s / EPD < 3.0 and 1.0 < (D6m - d6m) / (CT6 + CT7) < 3.35, the aperture size of the light passing through the rear lens can be adjusted. At the same time, with the constraints of the central thickness of the rear lens and the inner diameter of the spacer element, while ensuring the parameter requirements of the large aperture, it can avoid stray light caused by multiple reflections of light at the edge of the rear lens, which is beneficial to reducing stray light.

[0075] Of course, other parametric expressions in the above embodiments may also be included in this embodiment, which will not be elaborated one by one here.

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

[0077] The 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 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 imaging device is not limited to including seven lenses. If necessary, the imaging device may also include other numbers of lenses.

[0079] Figure 1 A schematic diagram of the dimensions of an imaging device of the present application is shown. Figure 1 Parameters such as D0s, D5s, d5s, D4bs, d4bs, D4s, d4m, d4s, d6s, d6m, D6s, D6m, and L are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the imaging device and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when the specific embodiments are described later.

[0080] The following further describes examples of specific surface shapes and parameters of the imaging device applicable to the above-mentioned embodiment 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 distance between lenses of the imaging device from the first lens to the seventh lens, as well as the coefficients of high-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 imaging device of the first embodiment is described. Figure 2 shows a schematic structural diagram of an imaging device of Embodiment 1-1, Figure 3 A schematic structural diagram of an imaging device according to Embodiment 1-2 is shown. Figure 4 A schematic structural diagram of the imaging device of Embodiments 1-3 is shown.

[0085] like Figures 2 to 4 As shown, the 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.

[0086] like Figure 2 As shown, it is a structural schematic diagram of the 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 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.

[0087] like Figure 3 FIG. 1 is a schematic diagram of the structure of the imaging device of Embodiment 1-2. In this example, the abutting manner of each spacing element is the same as that of Embodiment 1-1, and the relevant description in Embodiment 1-1 may be referred to, and will not be repeated here.

[0088] like Figure 4FIG. 1 is a schematic diagram of the structure of the imaging device of Embodiment 1-3. In this example, the abutting manner of each spacing element is the same as that of Embodiment 1-1, and the relevant description in Embodiment 1-1 may be referred to, and will not be repeated here.

[0089] In summary, the structural parameters of the imaging device of the first embodiment in the embodiments 1-1, 1-2 and 1-3 are shown in Table 2. (Unit: mm)

[0090] Data / Example 1-1 1-2 1-3 d4s 4.500 4.300 4.100 d4m 4.500 4.300 4.100 D4s 9.900 9.300 9.700 d5s 4.040 4.000 3.980 D5s 9.700 9.100 9.300 d6s 3.800 3.800 3.500 d6m 3.800 3.800 3.500 D6s 9.100 8.500 8.900 D6m 9.100 8.500 8.900 D0s 14.000 13.800 13.800 L 11.950 11.950 11.930 d0m 6.110 6.179 6.110 CP4 0.022 0.022 0.022

[0091] Table 2

[0092] 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 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.

[0093] In Example 1, the effective focal length f of the imaging device is 2.14 mm, the relative aperture FNO of the 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 imaging device is 78.30°.

[0094] Table 3 shows the basic structural parameters of the imaging device of the first embodiment, wherein the units of the curvature radius and thickness / distance are all millimeters.

[0095]

[0096] Table 3

[0097] 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:

[0098]

[0099] 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 curvature radius 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.

[0100] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.9742E-02 -1.6175E-03 4.7065E-04 1.4573E-04 -9.6019E-05 2.3711E-05 -3.3956E-06 S4 -9.8005E-03 -4.5776E-03 7.1739E-03 -1.0832E-02 1.2566E-02 -1.0083E-02 5.7530E-03 S5 -3.9555E-03 2.0514E-03 -4.1186E-03 2.5695E-03 1.0731E-03 -3.1814E-03 2.6179E-03 S6 -6.7693E-03 1.5080E-03 3.3157E-03 -8.4358E-03 9.0105E-03 -5.7561E-03 2.3856E-03 S7 -3.8447E-03 2.1265E-03 -3.8872E-05 -3.3901E-03 4.4909E-03 -3.1535E-03 1.3954E-03 S8 3.9483E-02 2.2007E-02 -8.8830E-02 1.1039E-01 -8.4475E-02 4.4221E-02 -1.6307E-02 S9 -1.0518E-01 1.5414E-01 -2.0162E-01 1.8867E-01 -1.2517E-01 5.9376E-02 -2.0165E-02 S10 -1.5120E-01 1.6921E-01 -1.6397E-01 1.2074E-01 -6.0950E-02 1.8738E-02 -2.0731E-03 S11 2.1347E-02 -1.4480E-02 1.4359E-02 -1.1415E-02 5.2646E-03 2.0974E-05 -1.6701E-03 S12 1.1557E-01 -2.1753E-01 4.6463E-01 -7.6354E-01 9.0797E-01 -7.7906E-01 4.8451E-01 S13 -9.4698E-02 -1.6157E-03 -4.8204E-04 9.9184E-02 -2.6480E-01 3.6057E-01 -3.0810E-01 S14 -1.8074E-01 1.3268E-01 -1.1422E-01 7.7318E-02 -3.4180E-02 6.5591E-03 2.3032E-03 Face number A18 A20 A22 A24 A26 A28 A30 S3 3.0388E-07 -1.6904E-08 5.4427E-10 -7.9364E-12 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.3811E-03 7.1677E-04 -1.5504E-04 2.3421E-05 -2.3399E-06 1.3865E-07 -3.6819E-09 S5 -1.2036E-03 3.4025E-04 -5.8808E-05 5.7148E-06 -2.3958E-07 0.0000E+00 0.0000E+00 S6 -6.5669E-04 1.1899E-04 -1.3585E-05 8.8035E-07 -2.4437E-08 0.0000E+00 0.0000E+00 S7 -4.0795E-04 7.8856E-05 -9.7050E-06 6.8907E-07 -2.1469E-08 0.0000E+00 0.0000E+00 S8 4.2409E-03 -7.6212E-04 9.0113E-05 -6.3103E-06 1.9837E-07 0.0000E+00 0.0000E+00 S9 4.8579E-03 -8.0974E-04 8.8737E-05 -5.7490E-06 1.6685E-07 0.0000E+00 0.0000E+00 S10 -8.2619E-04 4.2200E-04 -8.5975E-05 8.7958E-06 -3.6959E-07 0.0000E+00 0.0000E+00 S11 1.0942E-03 -3.6716E-04 7.1176E-05 -7.5794E-06 3.4490E-07 0.0000E+00 0.0000E+00 S12 -2.1831E-01 7.0520E-02 -1.5917E-02 2.3836E-03 -2.1285E-04 8.5817E-06 0.0000E+00 S13 1.7617E-01 -6.8642E-02 1.8033E-02 -3.0601E-03 3.0307E-04 -1.3309E-05 0.0000E+00 S14 -2.2130E-03 8.3123E-04 -1.8810E-04 2.7264E-05 -2.4790E-06 1.2894E-07 -2.9346E-09

[0101] Table 4

[0102] Figure 5 The axial chromatic aberration curve of the 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 imaging device. Figure 6 The astigmatism curve of the 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 imaging device of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field of view angles.

[0103] according to Figures 5 to 7 It can be seen that the imaging device provided in the first embodiment can achieve good imaging quality.

[0104] Embodiment 2

[0105] like Figures 8 to 13 As shown, the imaging device of the second embodiment is described. Figure 8 A schematic structural diagram of an imaging device according to Embodiment 2-1 is shown. Fig. 9 A schematic structural diagram of an imaging device according to Embodiment 2-2 is shown. Fig.10 A schematic structural diagram of the imaging device of Embodiment 2-3 is shown.

[0106] like Figures 8 to 10 As shown, the imaging device includes a lens barrel P0 and a first lens E1, a first spacing element P1, a first auxiliary spacing element P1b, 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 surface 10, an image side end surface 20, an outer annular surface 30 and an inner annular surface 40.

[0107] like Figure 8, which is a schematic diagram of the structure of the imaging device of Example 2-1. In this example, a sixth auxiliary spacer element P6b is also provided, and the sixth auxiliary spacer element P6b is located between the sixth spacer element P6 and the seventh lens E7. The object side surface and the 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 of the first auxiliary spacer element P1b, and the image side surface of the first auxiliary spacer element P1b is in contact with the object side surface S3 of the second lens. The object side surface and the 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 the 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 in contact with the object side surface S7 of the fourth lens. The object side surface and the 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 in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively. The object side surface and image side surface of the sixth spacer element P6 are in contact with the image side surface S12 of the sixth lens and the object side surface of the sixth auxiliary spacer element P6b, respectively. The image side surface of the sixth auxiliary spacer element P6b is in contact with the object side surface S13 of the seventh lens.

[0108] like Fig. 9 , which is a schematic structural diagram of an imaging device of Example 2-2. In this example, the abutting manner of each spacing element is the same as that of Example 2-1, and reference may be made to the relevant description in Example 2-1, which will not be repeated here.

[0109] like Fig.10 , which is a schematic diagram of the structure of the imaging device of Example 2-3. In this example, the sixth auxiliary spacer element P6b is not provided. At this time, 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 abutting manner of the remaining spacer elements is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and no further description is given here.

[0110] In summary, the structural parameters of the imaging device of the second embodiment in the embodiments 2-1, 2-2 and 2-3 are shown in Table 5. (Unit: mm)

[0111] Data / Example 2-1 2-2 2-3 d4s 5.120 5.220 5.020 d4m 5.120 5.220 5.020 D4s 9.100 8.900 9.200 d5s 5.260 5.280 5.280 D5s 8.500 8.300 8.600 d6s 5.230 5.230 5.230 d6m 5.230 5.230 5.230 D6s 8.200 8.000 8.300 D6m 8.200 8.000 8.300 D0s 12.600 12.600 12.800 L 12.611 12.450 12.450 d0m 7.430 7.330 7.530 CP4 0.022 0.022 0.022

[0112] Table 5

[0113] In the second embodiment, 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 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 concave 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.

[0114] In Example 2, the effective focal length f of the imaging device is 2.13 mm, the relative aperture FNO of the imaging device is 1.19, the effective focal length f1 of the first lens is -5.20 mm, the effective focal length f2 of the second lens is -5.17 mm, the effective focal length f3 of the third lens is 3.30 mm, the effective focal length f4 of the fourth lens is 7.44 mm, the effective focal length f5 of the fifth lens is -4.60 mm, the effective focal length f6 of the sixth lens is 3.00 mm, the effective focal length f7 of the seventh lens is -7.50 mm, and the maximum semi-field angle Semi-FOV of the imaging device is 66.00°.

[0115] Table 6 shows the basic structural parameters of the imaging device of the second embodiment, wherein the units of the curvature radius and thickness / distance are all millimeters.

[0116]

[0117] Table 6

[0118] 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.

[0119]

[0120]

[0121] Table 7

[0122] Fig.11 The axial chromatic aberration curve of the 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 imaging device. Fig.12 The astigmatism curve of the 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 imaging device of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0123] according to Figures 11 to 13 It can be seen that the imaging device provided in the second embodiment can achieve good imaging quality.

[0124] Embodiment 3

[0125] like Figures 14 to 19 As shown, the imaging device of the third embodiment is described. Fig.14 A schematic structural diagram of an imaging device according to Embodiment 3-1 is shown. Fig.15 A schematic structural diagram of an imaging device according to Embodiment 3-2 is shown. Fig.16 A schematic structural diagram of the imaging device of Example 3-3 is shown.

[0126] like Figures 14 to 16 As shown, the 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 fourth lens E4, a fourth spacing element P4, a fourth auxiliary spacing element P4b, 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.

[0127] like Fig.14 As shown, it is a structural schematic diagram of the imaging device of Example 3-1. 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 S2 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 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 of the fourth auxiliary spacer element P4b, and the image side surface of the fourth auxiliary spacer element P4b is respectively in contact with 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.

[0128] like Fig.15 , which is a schematic structural diagram of an imaging device of Example 3-2. In this example, the abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0129] like Fig.16FIG. 3 is a schematic diagram of the structure of the imaging device of Example 3-3. In this example, the abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0130] In summary, the structural parameters of the imaging device of the third embodiment under the embodiments 3-1, 3-2 and 3-3 are shown in Table 8. (Unit: mm)

[0131] Data / Example 3-1 3-2 3-3 d4s 5.972 6.001 5.899 d4m 5.177 5.120 5.129 D4s 8.311 9.011 7.511 d4bs 4.708 4.710 4.710 D4bs 8.500 9.200 7.700 d5s 4.460 4.460 4.460 D5s 8.200 8.900 7.400 d6s 4.230 4.230 4.230 d6m 4.230 4.230 4.230 D6s 7.900 8.600 7.100 D6m 7.900 8.600 7.100 D0s 12.600 12.800 11.800 L 12.924 12.600 12.600 d0m 6.400 6.200 6.300 CP4 1.841 1.841 1.841

[0132] Table 8

[0133] In Embodiment 3, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is convex.

[0134] In Example 3, the total effective focal length f of the imaging device is 1.96 mm, the relative aperture FNO of the imaging device is 1.20, the effective focal length f1 of the first lens is -3.93 mm, the effective focal length f2 of the second lens is -19.42 mm, the effective focal length f3 of the third lens is 18.61 mm, the effective focal length f4 of the fourth lens is 6.97 mm, the effective focal length f5 of the fifth lens is 4.45 mm, the effective focal length f6 of the sixth lens is -3.30 mm, the effective focal length f7 of the seventh lens is 4.57 mm, and the maximum semi-field angle Semi-FOV of the imaging device is 69.00°.

[0135] Table 9 shows the basic structural parameters of the imaging device of the third embodiment, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0136]

[0137] Table 9

[0138] Table 10 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 3.

[0139]

[0140]

[0141] Table 10

[0142] Fig.17 The axial chromatic aberration curve of the imaging device of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging device. Fig.18 The astigmatism curve of the 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 imaging device of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field of view angles.

[0143] according to Figures 17 to 19 It can be seen that the imaging device provided in the third embodiment can achieve good imaging quality.

[0144] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0145] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 fnoΔTAN(Semi-FOV) 5.75 5.75 5.75 2.67 2.67 2.67 3.13 3.13 3.13 (D0s-d0m) / L 0.66 0.64 0.64 0.41 0.42 0.42 0.48 0.52 0.44 d0m / EPD 3.40 3.44 3.40 4.15 4.10 4.21 3.92 3.80 3.86 L / f 5.58 5.58 5.57 5.92 5.85 5.85 6.59 6.43 6.43 D4s / d4s 2.20 2.16 2.37 1.78 1.70 1.83 1.39 1.50 1.27 R8 / R9 -1.10 -1.10 -1.10 0.56 0.56 0.56 -1.28 -1.28 -1.28 (D4bs-d4bs) / CP4 2.06 2.44 1.62 (d5s-d4m) / f5 0.12 0.08 0.03 -0.03 -0.01 -0.06 -0.16 -0.15 -0.15 (D6m-d6m) / DT71 2.80 2.48 2.85 1.20 1.12 1.24 1.69 2.02 1.32 f4567 / f 2.39 2.39 2.39 2.32 2.32 2.32 1.58 1.58 1.58 d5s / EPD 2.25 2.22 2.21 2.94 2.95 2.95 2.73 2.73 2.73 (D6m-d6m) / (CT6+CT7) 3.28 2.91 3.34 1.01 0.94 1.04 2.60 3.09 2.03 d4s / DT42 2.06 1.97 1.87 1.98 2.02 1.94 2.63 2.64 2.59 d4m / DT51 2.10 2.01 1.92 2.02 2.06 1.98 2.19 2.17 2.17 D5s / d5s 2.40 2.28 2.34 1.62 1.57 1.63 1.84 2.00 1.66 D6s / d6s 2.39 2.24 2.54 1.57 1.53 1.59 1.87 2.03 1.68 d0m / DT72 2.82 2.85 2.82 2.57 2.54 2.61 2.88 2.79 2.84 d6m / DT71 2.01 2.01 1.85 2.11 2.11 2.11 1.95 1.95 1.95

[0146] Table 11

[0147] Table 12 shows the effective focal lengths of the lenses of the imaging devices of Embodiments 1 to 3.

[0148] Data / Example one two three f(mm) 2.14 2.13 1.96 FNO 1.19 1.19 1.20 f1(mm) -7.71 -5.20 -3.93 f2(mm) -10.66 -5.17 -19.42 f3(mm) 7.02 3.30 18.61 f4(mm) 3.89 7.44 6.97 f5(mm) -3.98 -4.60 4.45 f6(mm) 3.84 3.00 -3.30 f7(mm) -7.73 -7.50 4.57 f4567(mm) 5.12 4.95 3.10 Semi-fov(°) 78.30 66.00 69.00

[0149] Table 12

[0150] 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 imaging device described above.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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 imaging device, characterized in that: The lens barrel comprises a lens group and a spacer element group arranged in the lens barrel, wherein the lens barrel has an object side end surface, an image side end surface, an inner annular surface and an outer annular surface, and the inner annular surface is in a stepped shape; The lens group includes seven lenses, and the seven lenses are, from the object side to the image side, 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 optical power, a sixth lens with optical power, and a seventh lens with optical power, and an air gap is provided 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 second lens is concave; the object side surface of the third lens is convex; the image side surface of the fourth lens is convex; the image side surface of the fifth lens is concave; and the object side surface of the seventh lens is convex; The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with the image side surface portion of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface portion of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface portion of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface portion of the sixth lens; The aperture value fno of the imaging device and the maximum half field of view angle Semi-FOV of the imaging device satisfy: 2.6 <fno×TAN(Semi-FOV)<5.8; The outer 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 maximum axial height L from the object side end surface to the image side end surface of the lens barrel satisfy the following relationship: 0.4<(D0s-d0m) / L<0.

67.

2. The imaging device according to claim 1, characterized in that The inner diameter d0m of the image side end surface of the lens barrel and the entrance pupil diameter EPD of the imaging device satisfy the following relationship: 3.4≤d0m / EPD<4.

25.

3. The imaging device according to claim 1, characterized in that The maximum axial height L from the object side end surface to the image side end surface of the lens barrel and the effective focal length f of the imaging device satisfy the following: 5.5 <L / f<6.6。 4. The imaging device according to claim 1, characterized in that The refractive indices of the fourth lens to the seventh lens vary in a pattern of low, high, low, and high.

5. The imaging device according to claim 4, characterized in that The refractive index of the fourth lens is equal to the refractive index of the sixth lens, and the refractive index of the fifth lens is equal to the refractive index of the seventh lens.

6. The imaging device according to claim 1, characterized in that The object side outer diameter D4s of the fourth spacing element and the object side inner diameter d4s of the fourth spacing element satisfy: 1.2 <D4s / d4s<2.4。 7. The imaging device according to claim 1, characterized in that: The following conditions are satisfied between the object-side inner diameter d4s of the fourth spacer element and the image-side effective radius DT42 of the light-transmitting portion of the fourth lens: 1.85 < d4s / DT42 < 2.65; the following conditions are satisfied between the image-side inner diameter d4m of the fourth spacer element and the object-side effective radius DT51 of the light-transmitting portion of the fifth lens: 1.90 < d4m / DT51 < 2.

20.

8. The imaging device according to claim 1, characterized in that The following conditions are satisfied between the curvature radius R8 of the image-side surface of the fourth lens and the curvature radius R9 of the object-side surface of the fifth lens: -1.3 < R8 / R9 < 0.

6.

9. The imaging device according to claim 8, characterized in that: When both the curvature radius R7 of the object-side surface of the fourth lens and the curvature radius R8 of the image-side surface of the fourth lens are negative values, the spacer element group further includes a fourth auxiliary spacer element, the fourth auxiliary spacer element is located between the fourth spacer element and the fifth lens, and the image-side surface of the fourth auxiliary spacer element is in partial contact with the object-side surface of the fifth lens. The following conditions are satisfied among the object-side outer diameter D4bs of the fourth auxiliary spacer element, the object-side inner diameter d4bs of the fourth auxiliary spacer element, and the central thickness CP4 of the fourth spacer element: 1.6 < (D4bs - d4bs) / CP4 < 2.

5.

10. The imaging device according to claim 1, characterized in that The following conditions are satisfied among the object-side inner diameter d5s of the fifth spacer element, the image-side inner diameter d4m of the fourth spacer element, and the effective focal length f5 of the fifth lens: -0.2 < (d5s - d4m) / f5 < 0.

15.

11. The imaging device according to claim 1, characterized in that The following conditions are satisfied between the object-side outer diameter D5s and the object-side inner diameter d5s of the fifth spacer element: 1.55 < D5s / d5s ≤ 2.40; the following conditions are satisfied between the object-side outer diameter D6s and the object-side inner diameter d6s of the sixth spacer element: 1.50 < D6s / d6s < 2.

55.

12. The imaging device according to claim 1, characterized in that The following conditions are satisfied among the image-side outer diameter D6m of the sixth spacer element, the image-side inner diameter d6m of the sixth spacer element, and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens: 1.1 < (D6m - d6m) / DT71 < 2.

9.

13. The imaging device according to claim 1, characterized in that The following conditions are satisfied between the inner diameter d0m of the image-side end face of the lens barrel and the image-side effective radius DT72 of the light-transmitting portion of the seventh lens: 2.5 < d0m / DT72 < 2.9; the following conditions are satisfied between the image-side inner diameter d6m of the sixth spacer element and the object-side effective radius DT71 of the light-transmitting portion of the seventh lens: 1.85 ≤ d6m / DT71 < 2.

15.

14. The imaging device according to claim 1, characterized in that The following conditions are satisfied between the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the imaging device: 1.5 < f4567 / f ≤ 2.4.

Images