Image forming apparatus

Abstract

The utility model provides an imaging device. 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. According to the utility model, the problem of serious stray light caused by the fact that an imaging device with seven lenses in the prior art meets the requirements of ultra-wide angle and large aperture is solved.

Description

TECHNICAL FIELD

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

[0002] In modern electronic products, the imaging quality of the imaging device has become one of the key factors for users to choose. With the progress of technology, users have higher and higher requirements for the performance of the imaging device, especially in the aspects of ultra-wide angle and large aperture. Satisfying the ultra-wide angle enables the imaging device to provide a wider field of view, and satisfying the large aperture can capture more light, which can 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 to satisfy the ultra-wide angle and the large aperture, because a large amount of light enters and is continuously refracted between the lenses, the problem of stray light is particularly serious. This stray light has a negative impact on the normal light path imaging, reducing the imaging quality.

[0004] That is, the imaging device of seven lenses in the prior art has the problem that satisfying the requirements of ultra-wide angle and large aperture leads to serious stray light. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the utility model is to provide an imaging device to solve the problem that the imaging device of seven lenses in the prior art has the problem that satisfying the requirements of ultra-wide angle and large aperture leads to serious stray light.

[0006] In order to achieve the above object, according to one aspect of the present application, an imaging device is provided, comprising a lens barrel and a lens group and a spacer group arranged 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, the inner annular face is in a stepped shape; the lens group comprises seven lenses, the seven lenses are sequentially arranged from the object side to the image side as 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, there is an air gap between any two adjacent lenses among the first lens to the seventh lens; the object side face of the first lens is a convex face, and the image side face is a concave face; the image side face of the second lens is a concave face; the object side face of the third lens is a convex face; the image side face of the fourth lens is a convex face; the image side face of the fifth lens is a concave face; the object side face of the seventh lens is a convex face; the spacer group comprises a first spacer element arranged between the first lens and the second lens and partially in contact with the image side face of the first lens, a second spacer element arranged between the second lens and the third lens and partially in contact with the image side face of the second lens, a third spacer element arranged between the third lens and the fourth lens and partially in contact with the image side face of the third lens, a fourth spacer element arranged between the fourth lens and the fifth lens and partially in contact with the image side face of the fourth lens, a fifth spacer element arranged between the fifth lens and the sixth lens and partially in contact with the image side face of the fifth lens, and a sixth spacer element arranged between the sixth lens and the seventh lens and partially in contact with the image side face of the sixth lens; the aperture value fno of the imaging device and the maximum half field angle Semi-FOV of the imaging device satisfy: 2.6 < fno x 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 utility model, provide a kind of imaging device, including lens barrel and the lens group and interval element group being arranged in lens barrel, lens barrel has object side end face, image side end face, inner ring surface and outer ring surface, inner ring surface is in echelon shape;The lens group includes seven lenses, seven lenses are sequentially from object side to image side the first lens with negative focal power, the second lens with negative focal power, the third lens with positive focal power, the fourth lens with positive focal power, the fifth lens with focal power, the sixth lens with focal power and the seventh lens with focal power, there is air interval between adjacent two lenses in the first lens to the seventh lens;Interval element group includes the first interval element being placed between the first lens and the second lens and with the image side surface portion of the first lens contact, the second interval element being placed between the second lens and the third lens and with the image side surface portion of the second lens contact, the third interval element being placed between the third lens and the fourth lens and with the image side surface portion of the third lens contact, the fourth interval element being placed between the fourth lens and the fifth lens and with the image side surface portion of the fourth lens contact, the fifth interval element being placed between the fifth lens and the sixth lens and with the image side surface portion of the fifth lens contact and the sixth interval element being placed between the sixth lens and the seventh lens and with the image side surface portion of the sixth lens contact;Between the aperture value fno of imaging device and the maximum half field angle Semi-FOV of imaging device, it satisfies:2.6<fno×TAN (Semi-FOV)<5.8;Between the image side outer diameter D6m of the sixth interval element, the image side inner diameter d6m of the sixth interval element and the object side effective radius DT71 of the light transmission part of the seventh lens, it satisfies:1.1<(D6m-d6m) / DT71<2.9.

[0008] According to another aspect of the present application, an imaging device is provided, comprising a lens barrel and a lens group and a spacer element group arranged 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, the inner annular face is in a stepped shape; the lens group comprises seven lenses, the seven lenses are sequentially arranged from the object side to the image side as 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, and there is an air gap between any two adjacent lenses among the first lens to the seventh lens; the spacer element group comprises a first spacer element arranged between the first lens and the second lens and in contact with the image side face of the first lens, a second spacer element arranged between the second lens and the third lens and in contact with the image side face of the second lens, a third spacer element arranged between the third lens and the fourth lens and in contact with the image side face of the third lens, a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side face of the fourth lens, a fifth spacer element arranged between the fifth lens and the sixth lens and in contact with the image side face of the fifth lens, and a sixth spacer element arranged between the sixth lens and the seventh lens and in 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 of 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 index of the fourth lens to the seventh lens is in a variation rule of low, high, low and 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, a relationship between an object side inner diameter d4s of the fourth spacer element and an image side effective radius DT42 of the light transmitting portion of the fourth lens satisfies: 1.85 < d4s / DT42 < 2.65; a relationship between an image side inner diameter d4m of the fourth spacer element and an object side effective radius DT51 of the light transmitting portion of the fifth lens satisfies: 1.90 < d4m / DT51 < 2.20.

[0015] Further, a relationship between a curvature radius R8 of the image side surface of the fourth lens and a curvature radius R9 of the object side surface of the fifth lens satisfies: -1.3 < R8 / R9 < 0.6.

[0016] Further, when 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 both negative, 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 an image side surface of the fourth auxiliary spacer element partially contacts an object side surface of the fifth lens, a relationship between an object side outer diameter D4bs of the fourth auxiliary spacer element, an object side inner diameter d4bs of the fourth auxiliary spacer element and a central thickness CP4 of the fourth spacer element satisfies: 1.6 < (D4bs-d4bs) / CP4 < 2.5.

[0017] Further, a relationship between an object side inner diameter d5s of the fifth spacer element, an image side inner diameter d4m of the fourth spacer element and an effective focal length f5 of the fifth lens satisfies: -0.2 < (d5s-d4m) / f5 < 0.15.

[0018] Further, a relationship between an object side outer diameter D5s of the fifth spacer element and an object side inner diameter d5s of the fifth spacer element satisfies: 1.55 < D5s / d5s ≤ 2.40; a relationship between an object side outer diameter D6s of the sixth spacer element and an object side inner diameter d6s of the sixth spacer element satisfies: 1.50 < D6s / d6s < 2.55.

[0019] Further, a relationship between an image side outer diameter D6m of the sixth spacer element, an image side inner diameter d6m of the sixth spacer element and an object side effective radius DT71 of the light transmitting portion of the seventh lens satisfies: 1.1 < (D6m-d6m) / DT71 < 2.9.

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

[0021] Further, a relationship between a combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and an effective focal length f of the imaging device satisfies: 1.5 < f4567 / f ≤ 2.4.

[0022] According to the technical scheme of the utility model, the imaging device of the application is composed of a lens barrel and seven lenses and a plurality of spacing elements arranged in the lens barrel, the positions of the seven lenses and the plurality of spacing elements are arranged reasonably, and the imaging device is arranged to meet 2.6 < fno x TAN (Semi-FOV) < 5.8, so that the angle of light entering the lens can be adjusted, and the imaging device with seven lenses can meet the parameter requirements of super wide angle and large aperture at the same time. However, in this case, the excessive angle requirement and aperture make a large amount of light enter the imaging device, and the light is continuously refracted between the lenses, which causes serious stray light problem, thereby affecting the overall performance of the imaging device. Therefore, the application restricts 0.4 < (D0s-d0m) / L < 0.67, strictly controls the front-rear end difference and height ratio of the lens barrel within a certain range, ensures that the tail end of the lens barrel is lower than the front end, can ensure that the stray light is intercepted at the tail end of the lens barrel, thereby avoiding 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 DRAWINGS

[0023] The drawings accompanying the specification of the application form a part of the application and serve to provide further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute improper limitations on the application. In the drawings:

[0024] Figure 1 A size marking diagram of the imaging device of one optional embodiment of the application is shown;

[0025] Figure 2 A structure schematic view of the imaging device of embodiment 1-1 of the application is shown;

[0026] Figure 3 A structure schematic view of the imaging device of embodiment 1-2 of the application is shown;

[0027] Figure 4 A structure schematic view of the imaging device of embodiment 1-3 of the application is shown;

[0028] Figures 5 to 7 An on-axis chromatic aberration curve, a distortion curve and a stigmation curve of the imaging device of embodiment one of the application are shown respectively;

[0029] Figure 8 A structure schematic view of the imaging device of embodiment 2-1 of the application is shown;

[0030] Figure 9 A structure schematic view of the imaging device of embodiment 2-2 of the application is shown;

[0031] Figure 10A structural schematic view of the imaging device of the embodiment 2-3 of the present application is shown;

[0032] Figures 11 to 13 The on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging device of the second embodiment of the present application are shown respectively;

[0033] Figure 14 A structural schematic view of the imaging device of the embodiment 3-1 of the present application is shown;

[0034] Figure 15 A structural schematic view of the imaging device of the embodiment 3-2 of the present application is shown;

[0035] Figure 16 A structural schematic view of the imaging device of the embodiment 3-3 of the present application is shown;

[0036] Figures 17 to 19 The on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging device of the third embodiment of the present application are shown respectively;

[0037] Figure 20 And Figure 21 The MTF curve diagram and the stray light diagram of the imaging device of one optional embodiment of the present application when meeting fno x TAN (Semi-FOV) = 5.75, (D0s-d0m) / L = 0.75 are shown respectively;

[0038] Figure 22 And Figure 23 The MTF curve diagram and the stray light diagram of the imaging device of one optional embodiment of the present application when meeting fno x TAN (Semi-FOV) = 5.75, (D0s-d0m) / L = 0.64 are shown respectively;

[0039] Figure 24 And Figure 25 The MTF curve diagram and the stray light diagram of the imaging device of one optional embodiment of the present application when meeting fno x TAN (Semi-FOV) = 5.75, (D0s-d0m) / L = 0.35 are shown respectively.

[0040] Among them, the above drawings include the following reference signs:

[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 element; P2, second spacer element; P3, third spacer element; P4, fourth spacer element; P5, fifth spacer element; P6, sixth spacer element. 10, object side end surface; 20, image side end surface; 30, outer annular surface; 40, inner annular surface. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0044] In the present application, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer of the contour of each component itself, but the above orientation words are not used to limit the present application.

[0045] It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0046] In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for the convenience of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0047] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those skilled in the art, with R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) to judge the concave and convex. In terms of the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; in terms of the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. 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 seven-piece lens imaging device in the prior art meets the requirements of ultra-wide angle and large aperture, resulting in serious stray light, the utility model provides an imaging device.

[0049] As Figures 1 to 25In an optional embodiment of the present application, the imaging device includes a lens barrel and a lens group and a spacer element group arranged 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, the inner annular face is stepped; the lens group includes seven lenses, the seven lenses are sequentially a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with refractive power, a sixth lens with refractive power and a seventh lens with refractive power from the object side to the image side, and there is an air gap between any two adjacent lenses among the first to seventh lenses; the object side face of the first lens is a convex face, and the image side face is a concave face; the image side face of the second lens is a concave face; the object side face of the third lens is a convex face; the image side face of the fourth lens is a convex face; the image side face of the fifth lens is a concave face; the object side face of the seventh lens is a convex face; the spacer element group includes a first spacer element arranged between the first lens and the second lens and partially in contact with the image side face of the first lens, a second spacer element arranged between the second lens and the third lens and partially in contact with the image side face of the second lens, a third spacer element arranged between the third lens and the fourth lens and partially in contact with the image side face of the third lens, a fourth spacer element arranged between the fourth lens and the fifth lens and partially in contact with the image side face of the fourth lens, a fifth spacer element arranged between the fifth lens and the sixth lens and partially in contact with the image side face of the fifth lens, and a sixth spacer element arranged between the sixth lens and the seventh lens and partially in contact with the image side face of the sixth lens; the aperture value fno of the imaging device and the maximum half field angle Semi-FOV of the imaging device satisfy: 2.6 < fno x 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 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 x TAN (Semi-FOV) < 5.8, the angle of light entering the lens can be adjusted, so that the imaging device with seven lenses can simultaneously satisfy the parameter requirements of ultra-wide angle and large aperture. However, in this case, the excessively large angle requirement and aperture make a large amount of light enter the imaging device, and the light is continuously refracted between the lenses, causing serious stray light problems, thereby affecting the overall performance of the imaging device. Therefore, by restricting 0.4 < (D0s-d0m) / L < 0.67, the front-to-back end difference and height ratio of the lens barrel are strictly controlled within a certain range, the tail end of the lens barrel is ensured to be lower than the front end, the stray light can be intercepted at the tail end of the lens barrel, thereby avoiding 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 bearing portion, the bearing portion is located at the outer circumferential side of the light-transmitting portion and is arranged around the circumference of the light-transmitting portion, and the light-transmitting portion is connected with the bearing portion and is integrally formed. The light-transmitting portion is used for the passing of imaging light, and the bearing portion is not used for the passing of imaging light and is used for abutting against a lens barrel or an adjacent lens or an adjacent spacer element.

[0052] In addition, referring to Table 1 and Figures 20 to 25 shown below, on the premise that the imaging device satisfies fno x TAN (Semi-FOV) = 5.75, Figure 20 and Figure 21 respectively show the MTF curve graph and the stray light graph when the imaging device satisfies (D0s-d0m) / L = 0.75, Figure 22 and Figure 23 respectively show the MTF curve graph and the stray light graph when the imaging device satisfies (D0s-d0m) / L = 0.64, Figure 24 and Figure 25 respectively show the MTF curve graph and the stray light graph when the imaging device satisfies (D0s-d0m) / L = 0.35.

[0053] It can be known from Figures 20 to 25 that when (D0s-d0m) / L = 0.75 is satisfied, the front and rear ends of the lens barrel are too large, the total length of the imaging device is too short, the light path is steeper, the partial field peak value of the MTF curve drops, and the stray light is also relatively obvious, the MTF curve graph and the stray light graph perform poorly, and at the same time, the optical system is compressed, affecting the performance of the imaging device. When (D0s-d0m) / L = 0.35 is satisfied, the front and rear ends of the lens barrel are too small, and the total length of the imaging device is too long, which will lead to that the tail end stray light cannot be well intercepted, the stray light is relatively obvious, the middle field peak value 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, the stray light is reduced, and at the same time, the contrast transfer performance of the MTF curve is higher, and the performance is better. As can be seen, when (D0s-d0m) / L is in the range of 0.4 to 0.67, the tail end of the lens barrel can be ensured to be lower than the front end, the stray light can be ensured to be intercepted at the tail end of the lens barrel, the stray light can be avoided from entering the imaging surface, the influence of the stray light on the imaging quality is reduced, and the overall imaging performance of the imaging device is improved.

[0054] Example One Example Two Example Three (D0s-d0m) / L 0.75 0.64 0.35 Performance Figure 20 Figure 22 Figure 24 Stray light diagram Figure 21 Figure 23 Figure 25

[0055] Table 1

[0056] In the embodiment, 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: 3.4≤d0m / EPD<4.25. By controlling the inner diameter of the image-side end surface of the lens barrel, the amount of light of the emergent 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 and the emergent light can be controlled, and the ratio of the object and the imaging can be controlled, so that the optical performance of the imaging device meets the design requirements.

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

[0058] In the embodiment, the refractive index of the fourth lens to the seventh lens is low, high, low, and high. Specifically, the low and high here refer to the refractive index of the adjacent two 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. By matching the refractive index of low, high, low, and high, the size of the lens can be adjusted appropriately, which is beneficial to improve the assembly performance and improve the imaging quality, and can effectively improve the field curvature and improve the overall performance of the imaging device.

[0059] In the embodiment, 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. The refractive index represents the refractive ability of the lens to light, by controlling the refractive index of the fourth lens and the sixth lens, and the refractive index of the fifth lens and the seventh lens, the chromatic dispersion of the lens is balanced, and the imaging quality is improved.

[0060] In the embodiment, 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. By controlling the object-side inner diameter of the fourth spacer element, the amount of light passing 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 amount of light can be controlled while the size of the imaging device is constrained.

[0061] In the embodiment, 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 satisfy 1.85 < d4s / DT42 < 2.65; 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 satisfy 1.90 < d4m / DT51 < 2.20. By controlling the two conditional expressions, the effective light fluxes entering the fourth lens and the fifth lens are controlled, and the generation of stray light is avoided.

[0062] In the embodiment, 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 satisfy -1.3 < R8 / R9 < 0.6. The curvature radius reflects the bending degree 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 improved, and the optical performance of the lens is improved.

[0063] In the embodiment, when 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 both negative, 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 partially contacts the object-side surface of the fifth lens. 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 satisfy 1.6 < (D4bs-d4bs) / CP4 < 2.5. By controlling the ratio of the difference between the object-side inner diameter and the object-side outer diameter of the fourth auxiliary spacer element and the central thickness of the fourth spacer element, the size and the thickness of the fourth spacer element are controlled while the number of light rays passing through the fourth spacer element is controlled, and the overall lens structure is optimized while the generation of stray light is avoided.

[0064] In the embodiment, 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 satisfy -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 and the effective focal length of the fifth lens, the size of the lens imaging is controlled while the trajectory of the light rays passing through the fifth lens is controlled, and the overall quality of the imaging device is improved.

[0065] In the embodiment, the object-side outer diameter D5s of the fifth spacer element and the object-side inner diameter d5s of the fifth spacer element satisfy 1.55 < D5s / d5s ≤ 2.40; the object-side outer diameter D6s of the sixth spacer element and the object-side inner diameter d6s of the sixth spacer element satisfy 1.50 < D6s / d6s < 2.55. By controlling the two conditional expressions, the number of light rays entering the sixth lens and the seventh lens can be controlled, and the generation of stray light is avoided.

[0066] In the embodiment, 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. 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, and by the ratio of the difference to the object-side effective diameter of the light-transmitting portion of the seventh lens, the effective optical path through the seventh lens and the overall proportion of the seventh lens can be adjusted, which is advantageous for avoiding stray light and improving the overall structure.

[0067] In the embodiment, 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 satisfy: 2.5 < d0m / DT72 < 2.9; and 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: 1.85 ≤ d6m / DT71 < 2.15. By controlling the two conditional expressions, the overall size of the imaging device is controlled while controlling the number and path of light rays passing through the seventh lens, and the generation of stray light and the overall performance are improved.

[0068] In the embodiment, 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 satisfy: 1.5 < f4567 / f ≤ 2.4. The combined focal length reflects the imaging size of the fourth lens to the seventh lens, and 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 embodiments of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. In the process of simulation using software and / or tools such as the above, the surface shape of each lens can be simulated according to the surface shape provided by the software and / or tools used, and appropriate adjustments can be made.

[0070] In another optional embodiment of the present application, an imaging device is also provided, comprising a lens barrel, a lens group and a spacer element group arranged in the lens barrel, the lens barrel having an object side end surface, an image side end surface, an inner annular surface and an outer annular surface, the inner annular surface being stepped; the lens group comprising seven lenses, the seven lenses being sequentially arranged from the object side to the image side as a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having refractive power, a sixth lens having refractive power and a seventh lens having refractive power, there being an air gap between any two adjacent lenses among the first lens to the seventh lens; the spacer element group comprising a first spacer element arranged between the first lens and the second lens and in contact with a part of the image side surface of the first lens, a second spacer element arranged between the second lens and the third lens and in contact with a part of the image side surface of the second lens, a third spacer element arranged between the third lens and the fourth lens and in contact with a part of the image side surface of the third lens, a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with a part of the image side surface of the fourth lens, a fifth spacer element arranged between the fifth lens and the sixth lens and in contact with a part of the image side surface of the fifth lens, and a sixth spacer element arranged between the sixth lens and the seventh lens and in contact with a part of the image side surface of the sixth lens; the aperture value fno of the imaging device and the maximum half field angle Semi-FOV of the imaging device satisfy: 2.6 < fno x 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 transmission part 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 and seven lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the refractive power of the seven lenses, the positions of the plurality of spacer elements and setting the imaging device to satisfy 2.6 < fno x TAN(Semi-FOV) < 5.8, the angle of light entering the lens can be adjusted, so that the imaging device with seven lenses can simultaneously satisfy the parameter requirements of ultra-wide angle and large aperture. However, in this case, the excessively large angle requirement and aperture cause a large amount of light to enter the imaging device, and the light continuously refracts between the lenses, causing serious stray light problems. Therefore, by constraining 1.1 < (D6m-d6m) / DT71 < 2.9, the size of the sixth spacer element and the amount of light entering the seventh lens can be controlled by controlling the difference between the image side outer diameter and the image side inner diameter of the sixth spacer element, and by the ratio of the difference to the object side effective diameter of the light transmission part of the seventh lens, the effective light path passing through the seventh lens and the overall proportion 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 parameter formulas in the above embodiments can also be included in the present embodiment, which will not be described one by one here.

[0073] In addition, in another optional embodiment of the present application, an imaging device is also provided, which comprises a lens barrel, a lens group and a spacer element group arranged in the lens barrel, the lens barrel has an object side end surface, an image side end surface, an inner annular surface and an outer annular surface, the inner annular surface is in a stepped shape; the lens group comprises seven lenses, the seven lenses are sequentially a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with refractive power, a sixth lens with refractive power and a seventh lens with refractive power from the object side to the image side, and there is an air gap between any two adjacent lenses among the first lens to the seventh lens; the spacer element group comprises a first spacer element arranged between the first lens and the second lens and in contact with a part of the image side surface of the first lens, a second spacer element arranged between the second lens and the third lens and in contact with a part of the image side surface of the second lens, a third spacer element arranged between the third lens and the fourth lens and in contact with a part of the image side surface of the third lens, a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with a part of the image side surface of the fourth lens, a fifth spacer element arranged between the fifth lens and the sixth lens and in contact with a part of the image side surface of the fifth lens, and a sixth spacer element arranged between the sixth lens and the seventh lens and in contact with a part of the image side surface 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 a plurality of spacer elements arranged in the lens barrel, by reasonably arranging the refractive power of the seven lenses, the positions of the plurality of 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 end lens can be matched with the central thickness of the rear end lens and the inner diameter of the spacer element, which can not only guarantee the parameter requirement of the large aperture but also avoid the stray light caused by the multiple reflections of the light at the edge of the rear end lens, which is conducive to reducing the stray light.

[0075] Of course, other parameter formulas in the above embodiments can also be included in the present embodiment, which will not be described one by one here.

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

[0077] The imaging device in the present application can employ multiple lenses, for example, seven lenses as described above. In the present application, at least one of the mirror surfaces of each lens is an aspheric mirror surface. The aspheric lens is characterized in that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has a better curvature radius characteristic, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspheric lens is employed, the aberration 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 the number of lenses constituting the imaging device can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present 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 can also include other numbers of lenses.

[0079] Figure 1 The size annotation diagram of one imaging device of the present application is shown, Figure 1 The parameters D0s, D5s, d5s, D4bs, d4bs, D4s, d4m, d4s, d6s, d6m, D6s, D6m, L, etc. are marked in the figure, so that the meaning of the parameters can be clearly and intuitively understood. In order to facilitate the description of the imaging device and the surface shape of the specific lens, these parameters will not be embodied in the figure when the specific embodiments are described below.

[0080] The specific surface shape and parameters of the imaging device applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0081] It should be noted that there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3 in the following embodiment one, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3 in the following embodiment two, and there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3 in the following embodiment three. The curvature radius, center thickness, etc. of the first lens to the seventh lens of the imaging device in the three examples in the same embodiment are the same, but the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the sixth spacing element, and the shape of part of the lens are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

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

[0083] Embodiment one

[0084] As Figures 2 to 7 shown, the imaging device of embodiment one is described. Figure 2 A structural schematic diagram of the imaging device of embodiment 1-1 is shown, Figure 3 A structural schematic diagram of the imaging device of embodiment 1-2 is shown, Figure 4 A structural schematic diagram of the imaging device of embodiment 1-3 is shown.

[0085] As Figures 2 to 4 shown, the imaging device includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a second auxiliary spacer element P2b, a third lens E3, a third spacer element P3, a third auxiliary spacer element P3b, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7 arranged in the lens barrel P0 in order 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] As Figure 2 shown, a structural schematic diagram of the imaging device of embodiment 1-1 is shown. In this example, the object side surface and the image side surface of the first spacer element P1 partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element P2 partially abut the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, respectively, and the image side surface of the second auxiliary spacer element P2b partially abuts the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 partially abut the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element P3b, respectively, and the image side surface of the third auxiliary spacer element P3b partially abuts the object side surface S7 of the fourth lens. The object side surface and the 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 the 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. The object side surface and the image side surface of the sixth spacer element P6 partially abut the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively.

[0087] As Figure 3 shown, a structural schematic diagram of the imaging device of embodiment 1-2 is shown. In this example, the abutting contact mode of each spacer element is the same as that of embodiment 1-1, and the relevant description in embodiment 1-1 can be referred to, which will not be repeated here.

[0088] As Figure 4Fig. 1 shows a structural schematic diagram of the imaging device of Example 1-1. In this example, the abutting mode of each spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 can be referred to, which will not be repeated here.

[0089] In summary, the structural parameters of the imaging device of Example 1 under Examples 1-1, 1-2 and 1-3 are shown in Table 2. (unit: mm)

[0090] Data / Examples 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 Example 1, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a concave surface. The object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface. The object side S5 of the third lens is a convex surface, and the image side S6 of the third lens is a convex surface. The object side S7 of the fourth lens is a convex surface, and the image side S8 of the fourth lens is a convex surface. The object side S9 of the fifth lens is a convex surface, and the image side S10 of the fifth lens is a concave surface. The object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a convex surface. The object side S13 of the seventh lens is a convex surface, and the image side 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 half field angle Semi-FOV of the imaging device is 78.30°.

[0094] Table 3 shows the basic structural parameter table of the imaging device of Example 1, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0095]

[0096] Table 3

[0097] In Example 1, the object side and the image side of the second lens E2 to the seventh lens E7 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0098]

[0099] wherein x is the distance from the vertex of the aspherical surface to the vertex height at a position of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical surfaces S3-S14 in Example 1.

[0100] Figure 11 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 Figure 12 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 13 An on-axis chromatic aberration curve of the imaging device of Example 1 is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging device. Figures 11 to 13 An astigmatism curve of the imaging device of Example 1 is shown, which represents the meridional image curvature and sagittal image curvature. Figures 14 to 19 A distortion curve of the imaging device of Example 1 is shown, which represents the distortion size values corresponding to different field angles.

[0103] According to Figure 14 It can be seen that the imaging device given in Example 1 can achieve good imaging quality.

[0104] Example 2

[0105] As Figure 15 shown, the imaging device of Example 2 is described. Figure 16 A structural schematic diagram of the imaging device of Example 2-1 is shown, Figures 14 to 16 A structural schematic diagram of the imaging device of Example 2-2 is shown, Figure 14 A structural schematic diagram of the imaging device of Example 2-3 is shown.

[0106] As Figure 15 shown, the imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 from the object side to the image side in sequence, a first lens E1, a first spacer element P1, a first auxiliary spacer element P1b, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a third auxiliary spacer element P3b, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7. 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] As Figure 16The diagram shown is a schematic representation of the imaging device in Embodiment 2-1. In this example, a sixth auxiliary spacer element P6b is also provided, located between the sixth spacer element P6 and the seventh lens E7. The object-side and image-side surfaces of the first spacer element P1 abut against the image-side surface S2 of the first lens and the object-side surface of the first auxiliary spacer element P1b, respectively. The image-side surface of the first auxiliary spacer element P1b abuts against the object-side surface S3 of the second lens. The object-side and image-side surfaces of the second spacer element P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 abut against the image-side surface S6 of the third lens and the object-side surface of the third auxiliary spacer element P3b, respectively. The image-side surface of the third auxiliary spacer element P3b abuts against the object-side surface S7 of the fourth lens. The object-side and image-side surfaces of the fourth spacer element P4 abut against the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 abut against the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 abut against 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 abuts against the object-side surface S13 of the seventh lens.

[0108] like Data / Examples The diagram shown is a schematic representation of the imaging device in Embodiment 2-2. In this example, the contact method between the spacer elements is the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1, which will not be repeated here.

[0109] like d4s The diagram shown is a schematic representation of the imaging device in Embodiments 2-3. In this example, the sixth auxiliary spacer element P6b is not provided. In this case, the object-side and image-side surfaces of the sixth spacer element P6 partially abut against the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The abutment and contact methods of the remaining spacer elements are the same as in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

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

[0111] d4m 2-1 2-2 2-3 D4s 5.120 5.220 5.020 d4bs 5.120 5.220 5.020 D4bs 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 embodiment two, the object side S1 of the first lens is convex, the image side S2 of the first lens is concave. The object side S3 of the second lens is concave, the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, the image side S6 of the third lens is convex. The object side S7 of the fourth lens is convex, the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is concave, the image side S10 of the fifth lens is concave. The object side S11 of the sixth lens is convex, the image side S12 of the sixth lens is convex. The object side S13 of the seventh lens is convex, the image side S14 of the seventh lens is concave.

[0114] In embodiment two, 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 half field angle Semi-FOV of the imaging device is 66.00°.

[0115] Table 6 shows the basic structure parameter table of the imaging device of embodiment two, wherein the units of the curvature radius, thickness / distance are millimeters mm.

[0116]

[0117] Table 6

[0118] The following table 7 gives the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of the aspherical mirrors S3-S14 that can be used in embodiment two.

[0119]

[0120]

[0121] Table 7

[0122] Figure 17 The on-axis chromatic aberration curve of the imaging device of embodiment two is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the imaging device. Figure 18 The astigmatism curve of the imaging device of embodiment two is shown, which represents the meridional image surface bending and sagittal image surface bending. Figure 19 The distortion curve of the imaging device of embodiment two is shown, which represents the distortion size values corresponding to different field angles.

[0123] According to Figures 17 to 19 It can be seen that the imaging device given in Embodiment Two can achieve good imaging quality.

[0124] Embodiment Three

[0125] As Conditional / Examples shown, the imaging device of Embodiment Three is described. fno x TAN (Semi-FOV) A structural schematic diagram of the imaging device of Embodiment 3-1 is shown, (D0s-d0m) / L A structural schematic diagram of the imaging device of Embodiment 3-2 is shown, d0m / EPD A structural schematic diagram of the imaging device of Embodiment 3-3 is shown.

[0126] As L / f shown, the imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 from the object side to the image side in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7. 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] As D4s / d4s shown, a structural schematic diagram of the imaging device of Embodiment 3-1 is shown. In this example, the object side surface and the image side surface of the first spacer element P1 partially abut against the image side surface S2 of the first lens and the object side surface S2 of the second lens, respectively. The object side surface and the image side surface of the second spacer element P2 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and the image side surface of the third spacer element P3 partially abut against the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and the image side surface of the fourth spacer element P4 partially abut against 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 partially abuts against the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer element P5 partially abut against 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 the image side surface of the sixth spacer element P6 partially abut against the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively.

[0128] As R8 / R9 shown, a structural schematic diagram of the imaging device of Embodiment 3-2 is shown. In this example, the abutting abutment modes of the spacer elements are the same as those of Embodiment 3-1, and reference can be made to the relevant description in Embodiment 3-1, which will not be described here.

[0129] As (D4bs-d4bs) / CP4Fig. 3 shows a structural schematic diagram of the imaging device of Example 3-3. In this example, the abutting mode of each spacer element is the same as that of Example 3-1, and the relevant description in Example 3-1 can be referred to, which will not be repeated here.

[0130] In summary, the structural parameters of the imaging device of Example Three under Examples 3-1, 3-2 and 3-3 are shown in Table 8 (unit: mm).

[0131] (d5s-d4m) / f5 3-1 3-2 3-3 (D6m-d6m) / DT71 5.972 6.001 5.899 f4567 / f 5.177 5.120 5.129 d5s / EPD 8.311 9.011 7.511 (D6m-d6m) / (CT6+CT7) 4.708 4.710 4.710 d4s / DT42 8.500 9.200 7.700 d4m / DT51 4.460 4.460 4.460 D5s / d5s 8.200 8.900 7.400 D6s / d6s 4.230 4.230 4.230 d0m / DT72 4.230 4.230 4.230 d6m / DT71 7.900 8.600 7.100 Data / Examples 7.900 8.600 7.100 One 12.600 12.800 11.800 L 12.924 12.600 12.600 Two 6.400 6.200 6.300 Three 1.841 1.841 1.841

[0132] Table 8

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

[0134] In Example Three, 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 half field angle Semi-FOV of the imaging device is 69.00°.

[0135] Table 9 shows the basic structural parameter table of the imaging device of Example Three, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0136]

[0137] Table 9

[0138] The following Table 10 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of the aspherical mirrors S3-S14 that can be used in Example Three.

[0139]

[0140]

[0141] Table 10

[0142] f (mm) A tangential chromatic aberration curve of the imaging device of Embodiment Three is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging device. FNO A astigmatism curve of the imaging device of Embodiment Three is shown, which represents the meridional image curvature and sagittal image curvature. f1 (mm) A distortion curve of the imaging device of Embodiment Three is shown, which represents the distortion size values corresponding to different field angles.

[0143] According to f2 (mm) It can be seen that the imaging device given by Embodiment Three can achieve good imaging quality.

[0144] In summary, Embodiments One to Three respectively satisfy the relationships shown in Table 11.

[0145] f3 (mm) 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f4 (mm) 5.75 5.75 5.75 2.67 2.67 2.67 3.13 3.13 3.13 f5 (mm) 0.66 0.64 0.64 0.41 0.42 0.42 0.48 0.52 0.44 f6 (mm) 3.40 3.44 3.40 4.15 4.10 4.21 3.92 3.80 3.86 f7 (mm) 5.58 5.58 5.57 5.92 5.85 5.85 6.59 6.43 6.43 f4567 (mm) 2.20 2.16 2.37 1.78 1.70 1.83 1.39 1.50 1.27 Semi-fov (°) -1.10 -1.10 -1.10 0.56 0.56 0.56 -1.28 -1.28 -1.28 ​ 2.06 2.44 1.62 ​ 0.12 0.08 0.03 -0.03 -0.01 -0.06 -0.16 -0.15 -0.15 ​ 2.80 2.48 2.85 1.20 1.12 1.24 1.69 2.02 1.32 ​ 2.39 2.39 2.39 2.32 2.32 2.32 1.58 1.58 1.58 ​ 2.25 2.22 2.21 2.94 2.95 2.95 2.73 2.73 2.73 ​ 3.28 2.91 3.34 1.01 0.94 1.04 2.60 3.09 2.03 ​ 2.06 1.97 1.87 1.98 2.02 1.94 2.63 2.64 2.59 ​ 2.10 2.01 1.92 2.02 2.06 1.98 2.19 2.17 2.17 ​ 2.40 2.28 2.34 1.62 1.57 1.63 1.84 2.00 1.66 ​ 2.39 2.24 2.54 1.57 1.53 1.59 1.87 2.03 1.68 ​ 2.82 2.85 2.82 2.57 2.54 2.61 2.88 2.79 2.84 ​ 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 length and the like of each lens of the imaging devices of Embodiments One to Three.

[0148] ​ ​ ​ ​ ​ 2.14 2.13 1.96 ​ 1.19 1.19 1.20 ​ -7.71 -5.20 -3.93 ​ -10.66 -5.17 -19.42 ​ 7.02 3.30 18.61 ​ 3.89 7.44 6.97 ​ -3.98 -4.60 4.45 ​ 3.84 3.00 -3.30 ​ -7.73 -7.50 4.57 ​ 5.12 4.95 3.10 ​ 78.30 66.00 69.00

[0149] Table 12

[0150] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated on 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 application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the protection scope of the present application.

[0152] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, work, device, component and / or combination thereof.

[0153] It should be noted that the terms "first", "second", and the like used in the description and the claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, 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 only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An imaging device, characterized in that, The lens 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 surface and an outer ring surface, and the inner ring surface is stepped. The lens group comprises seven lenses, which, from the object side to the image side, are sequentially arranged as follows: 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. There is an air gap between any two adjacent lenses from the first lens to the seventh lens. The object side of the first lens is convex, and the image side is concave. The image side of the second lens is concave. The object side of the third lens is convex. The image side of the fourth lens is convex. The image side of the fifth lens is concave. The object side of the seventh lens is convex. The spacer element group includes a first spacer element placed between the first lens and the second lens and 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 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 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 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 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 in contact with the image-side surface of the sixth lens. The aperture value fno of the imaging device and the maximum semi-FOV of the imaging device satisfy the following relationship: 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 the following condition: 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 face of the lens tube and the entrance pupil diameter EPD of the imaging device satisfy the following condition: 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 face to the image-side end face of the lens tube satisfies the following relationship with the effective focal length f of the imaging device: 5.5 <L / f<6.6。 4. The imaging device according to claim 1, characterized in that, The refractive indices of the fourth to the seventh lenses exhibit a low-high-low-high variation.

5. The imaging device according to claim 4, characterized in that, 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.

6. The imaging device according to claim 1, characterized in that, The object-side outer diameter D4s of the fourth spacer element and the object-side inner diameter d4s of the fourth spacer element satisfy the following condition: 1.2 <D4s / d4s<2.4。 7. The imaging apparatus according to claim 1, characterized in that, 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 satisfy: 1.85 < d4s / DT42 < 2.65; 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 satisfy: 1.90 < d4m / DT51 < 2.

20.

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

6.

9. The imaging apparatus according to claim 8, characterized in that, When the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens are both negative, 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 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 satisfy: 1.6 < (D4bs - d4bs) / CP4 < 2.

5.

10. The imaging apparatus according to claim 1, characterized in that, 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 satisfy: -0.2 < (d5s - d4m) / f5 < 0.

15.

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

55.

12. The imaging apparatus according to claim 1, characterized in that, 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 satisfy: 1.1 < (D6m - d6m) / DT71 < 2.

9.

13. The imaging apparatus according to claim 1, characterized in that, 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 satisfy: 2.5 < d0m / DT72 < 2.9; 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: 1.85 ≤ d6m / DT71 < 2.

15.

14. The imaging apparatus according to claim 1, characterized in that, 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 satisfy: 1.5 < f4567 / f ≤ 2.4.

Images