Camera lens

Abstract

The present invention provides a camera lens. The camera lens includes at least five lenses with optical power in sequence from the object side to the image side along the optical axis, and the at least five lenses include: a first lens with positive optical power; a second lens with negative optical power; a negative lens close to the image side of at least five lenses, the negative lens has negative optical power; a positive lens adjacent to the object side of the negative lens, the positive lens has positive optical power; an infrared cut-off filter element, the infrared cut-off filter element is arranged on the object side of the imaging surface, and the object side of the infrared cut-off filter element is an aspherical surface; wherein the maximum half field of view Semi‑FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging surface, and the half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / (ImgH*Tan(Semi‑FOV))<1.65. The present invention solves the problem that it is difficult to take both small TTL and high optical performance into consideration at the same time in the camera lens in the prior art.

Description

Technical Field

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

[0002] With the development of science and technology and the progress of society, smart devices have gradually entered people's lives. There are many types of smart devices, including smart phones, tablets, notebooks, cameras, etc. In the context of the continuous pursuit of large image and high pixel of smart phones, users have higher and higher requirements for the thin and light appearance of mobile phones, and the requirements for camera lenses have gradually evolved from large image to large image plus small TTL. As the image surface of the camera lens increases and the TTL decreases, the performance parameters of the camera lens will be somewhat lower than that of the conventional large image lens before, which will inevitably affect the presentation effect of the camera lens image.

[0003] That is to say, the camera lens in the prior art has the problem that it is difficult to achieve both low TTL and high optical performance at the same time. Summary of the invention

[0004] The main purpose of the present invention is to provide a camera lens to solve the problem that the camera lens in the prior art has a low TTL and a high optical performance that are difficult to achieve at the same time.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a camera lens, which includes at least five lenses with optical power in sequence from the object side to the image side along the optical axis, and the at least five lenses include: a first lens with positive optical power; a second lens with negative optical power; a negative lens close to the image side of the at least five lenses, the negative lens has negative optical power; a positive lens adjacent to the object side of the negative lens, the positive lens has positive optical power; an infrared cutoff filter element, the infrared cutoff filter element is arranged on the object side of the imaging plane, and the object side surface of the infrared cutoff filter element is an aspherical surface; wherein the maximum semi-field angle Semi-FOV of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging plane, and the half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following relationship: TTL / (ImgH*Tan(Semi-FOV))<1.65.

[0006] Furthermore, the maximum half field of view angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following conditions: 1.8 mm <EPD*Tan(Semi-FOV)<3.5mm。

[0007] Furthermore, the F number Fno of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging surface, and the entrance pupil diameter EPD of the camera lens satisfy: 4.0≤Fno*(TTL / EPD)≤4.8.

[0008] Furthermore, the F number Fno of the camera lens, the axial distance TTL from the object side of the first lens to the imaging surface and the half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: 1.4 <Fno*(ImgH / TTL)<2.0。

[0009] Furthermore, the axial distance TTL from the object side surface of the first lens to the imaging surface, half of the diagonal length of the effective pixel area on the imaging surface ImgH, and the effective focal length f of the camera lens satisfy the following relationship: (TTL / f)*(TTL / ImgH)<1.60.

[0010] Furthermore, the effective focal length f of the camera lens and the curvature radius R of the object side of the infrared cutoff filter element are TP Between: 10*f / |R TP |<1.0.

[0011] Furthermore, the effective focal length f of the camera lens and the effective focal length f of the infrared cutoff filter element TP Between: 10*f / |f TP |<0.5.

[0012] Furthermore, the central thickness C of the infrared cutoff filter element TP The edge thickness E of the infrared cutoff filter element at the maximum effective radius TP Satisfaction between: 0.9 <C TP / E TP ≤1.5.

[0013] Furthermore, the effective focal length f of the camera lens and the effective focal length fi of the negative lens satisfy: <f / fi<-1。

[0014] Furthermore, the effective focal length f of the camera lens, the effective focal length fo of the positive lens and the effective focal length fi of the negative lens satisfy: -1.0 <f / fo+f / fi<0。

[0015] Furthermore, the effective focal length f of the camera lens and the curvature radius Ri of the object side surface of the negative lens satisfy: 1.0 <f / Ri<4.0。

[0016] Furthermore, the curvature radius R1 of the object side surface of the first lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 <R4 / R1<4.5。

[0017] Furthermore, the effective focal length f of the camera lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -3.7 <f1 / f+f2 / f<-0.9。

[0018] Furthermore, the effective focal length f of the camera lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -1.5 <f1 / f+f2 / f<-0.9。

[0019] Furthermore, the infrared cutoff filter element is made of glass, an infrared cutoff film is arranged on the object side or image side of the infrared cutoff filter element, and the passband of the infrared cutoff filter element is 430nm-780nm.

[0020] Furthermore, the camera lens includes five lenses with optical power in sequence from the object side to the image side along the optical axis, and the five lenses include: a first lens with positive optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with positive optical power; and a fifth lens with negative optical power.

[0021] Furthermore, the center thickness CT1 of the first lens and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 2.0 <CT1 / T23<2.5。

[0022] Furthermore, the center thickness CT3 of the third lens and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.5 <CT3 / T45<2.0。

[0023] Furthermore, the camera lens includes seven lenses with optical power in sequence from the object side to the image side along the optical axis, and the seven lenses include: a first lens with positive optical power; a second lens with negative optical power; a third lens with optical power; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power.

[0024] Furthermore, the maximum half field of view Semi-FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging plane, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following relationship: TTL / (ImgH*Tan(Semi-FOV)<1.5.

[0025] Furthermore, the maximum half field of view angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following conditions: 2.5 mm <EPD*Tan(Semi-FOV)<3.5mm。

[0026] Further, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens satisfy: 3.0<(R12+R11) / (R12-R11)<4.0.

[0027] Furthermore, the center thickness CT6 of the sixth lens and the air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 1.0 <CT6 / T56<1.5。

[0028] According to another aspect of the present invention, there is provided a camera lens, which includes at least five lenses with optical power in sequence from the object side to the image side along the optical axis, and the at least five lenses include: a first lens with positive optical power; a second lens with negative optical power; a negative lens close to the image side of the at least five lenses, the negative lens has negative optical power; a positive lens adjacent to the object side of the negative lens, the positive lens has positive optical power; an infrared cutoff filter element, the infrared cutoff filter element is arranged on the object side of the imaging plane, and the object side surface of the infrared cutoff filter element is an aspherical surface; wherein the F number Fno of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging plane, and the entrance pupil diameter EPD of the camera lens satisfy the following relationship: 4.0≤Fno*(TTL / EPD)≤4.8.

[0029] Furthermore, the maximum half field angle Semi-FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging plane, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following conditions: TTL / (ImgH*Tan(Semi-FOV))<1.65; the maximum half field angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy the following conditions: 1.8 mm <EPD*Tan(Semi-FOV)<3.5mm。

[0030] Furthermore, the F number Fno of the camera lens, the axial distance TTL from the object side of the first lens to the imaging surface and the half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: 1.4 <Fno*(ImgH / TTL)<2.0。

[0031] Furthermore, the axial distance TTL from the object side surface of the first lens to the imaging surface, half of the diagonal length of the effective pixel area on the imaging surface ImgH, and the effective focal length f of the camera lens satisfy the following relationship: (TTL / f)*(TTL / ImgH)<1.60.

[0032] Furthermore, the effective focal length f of the camera lens and the curvature radius R of the object side of the infrared cutoff filter element are TP Between: 10*f / |R TP |<1.0.

[0033] Furthermore, the effective focal length f of the camera lens and the effective focal length f of the infrared cutoff filter element TP Between: 10*f / |f TP |<0.5.

[0034] Furthermore, the central thickness C of the infrared cutoff filter element TP The edge thickness E of the infrared cutoff filter element at the maximum effective radius TP Satisfaction between: 0.9 <C TP / E TP ≤1.5.

[0035] Furthermore, the effective focal length f of the camera lens and the effective focal length fi of the negative lens satisfy: <f / fi<-1。

[0036] Furthermore, the effective focal length f of the camera lens, the effective focal length fo of the positive lens and the effective focal length fi of the negative lens satisfy: -1.0 <f / fo+f / fi<0。

[0037] Furthermore, the effective focal length f of the camera lens and the curvature radius Ri of the object side surface of the negative lens satisfy: 1.0 <f / Ri<4.0。

[0038] Furthermore, the curvature radius R1 of the object side surface of the first lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 <R4 / R1<4.5。

[0039] Furthermore, the effective focal length f of the camera lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -3.7 <f1 / f+f2 / f<-0.9。

[0040] Furthermore, the effective focal length f of the camera lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -1.5 <f1 / f+f2 / f<-0.9。

[0041] Furthermore, the infrared cutoff filter element is made of glass, an infrared cutoff film is arranged on the object side or image side of the infrared cutoff filter element, and the passband of the infrared cutoff filter element is 430nm-780nm.

[0042] Furthermore, the camera lens includes five lenses with optical power in sequence from the object side to the image side along the optical axis, and the five lenses include: a first lens with positive optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with positive optical power; and a fifth lens with negative optical power.

[0043] Furthermore, the center thickness CT1 of the first lens and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 2.0 <CT1 / T23<2.5。

[0044] Furthermore, the center thickness CT3 of the third lens and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.5 <CT3 / T45<2.0。

[0045] Furthermore, the camera lens includes seven lenses with optical power in sequence from the object side to the image side along the optical axis, and the seven lenses include: a first lens with positive optical power; a second lens with negative optical power; a third lens with optical power; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power.

[0046] Furthermore, the maximum half field of view Semi-FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging plane, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following relationship: TTL / (ImgH*Tan(Semi-FOV)<1.5.

[0047] Furthermore, the maximum half field of view angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following conditions: 2.5 mm <EPD*Tan(Semi-FOV)<3.5mm。

[0048] Further, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens satisfy: 3.0<(R12+R11) / (R12-R11)<4.0.

[0049] Furthermore, the center thickness CT6 of the sixth lens and the air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 1.0 <CT6 / T56<1.5。

[0050] According to the technical solution of the present invention, a camera lens includes at least five lenses with optical power in sequence from the object side to the image side along the optical axis, wherein the at least five lenses include a first lens with positive optical power, a second lens with negative optical power, a negative lens close to the image side of the at least five lenses, a positive lens adjacent to the object side of the negative lens, and an infrared cut-off filter element, wherein the negative lens has negative optical power; the positive lens has positive optical power; the infrared cut-off filter element is arranged on the object side of the imaging plane, and the object side surface of the infrared cut-off filter element is an aspherical surface; wherein the maximum semi-field angle Semi-FOV of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging plane, and the half diagonal length ImgH of the effective pixel area on the imaging plane satisfy the following conditions: TTL / (ImgH*Tan(Semi-FOV))<1.65.

[0051] By rationally allocating the focal length of each lens, it is beneficial to balance the aberrations produced by the camera lens and greatly improve the imaging quality of the camera lens. The object side of the infrared cutoff filter element is set to an aspherical surface, and at the same time, the relationship between the maximum semi-field angle Semi-FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging surface, and the half of the diagonal length of the effective pixel area on the imaging surface ImgH is reasonably constrained, so that the infrared cutoff filter element and the optical system of the entire camera lens are optimized synchronously, ensuring that the image size remains unchanged, while reducing TTL, ensuring that the performance will not be significantly reduced, ensuring good optical performance of the camera lens, and meeting the requirements of large image surface and small size. At the same time, meeting the requirements of a large field angle is conducive to widening the shooting range. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0053] Figure 1 A schematic structural diagram of a camera lens according to Example 1 of the present invention is shown;

[0054] Figures 2 to 5 They are shown respectively Figure 1 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens in;

[0055] Figure 6 A schematic structural diagram of a camera lens according to Example 2 of the present invention is shown;

[0056] Figures 7 to 10 They are shown respectively Figure 6 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens in;

[0057] Fig.11 A schematic structural diagram of a camera lens according to Example 3 of the present invention is shown;

[0058] Figures 12 to 15 They are shown respectively Fig.11 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens in;

[0059] Fig.16 A schematic structural diagram of a camera lens according to Example 4 of the present invention is shown;

[0060] Figures 17 to 20 They are shown respectively Fig.16 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens in;

[0061] Fig.21 A schematic structural diagram of a camera lens according to Example 5 of the present invention is shown;

[0062] Figure 22 to Figure 25 They are shown respectively Fig.21 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens in;

[0063] Fig.26 A schematic structural diagram of a camera lens according to Example 6 of the present invention is shown;

[0064] Figures 27 to 30 They are shown respectively Fig.26 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens in;

[0065] Fig.31 A schematic structural diagram of a camera lens according to Example 7 of the present invention is shown;

[0066] Figure 32 to Figure 35 They are shown respectively Fig.31 The on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens.

[0067] The above drawings include the following reference numerals:

[0068] STO, aperture; 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. DETAILED DESCRIPTION

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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 surface of each lens close to the object side is called the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial region 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 region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0075] In order to solve the problem that it is difficult to simultaneously achieve both low TTL and high optical performance in a camera lens in the prior art, the present invention provides a camera lens.

[0076] Embodiment 1

[0077] like Figures 1 to 35 As shown, the camera lens includes at least five lenses with optical power in sequence from the object side to the image side along the optical axis, and the at least five lenses include a first lens with positive optical power, a second lens with negative optical power, a negative lens close to the image side of the at least five lenses, a positive lens adjacent to the object side of the negative lens, and an infrared cut-off filter element, wherein the negative lens has negative optical power; the positive lens has positive optical power; the infrared cut-off filter element is arranged on the object side of the imaging plane, and the object side surface of the infrared cut-off filter element is an aspherical surface; wherein the maximum semi-field angle Semi-FOV of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging plane, and the half diagonal length ImgH of the effective pixel area on the imaging plane satisfy the following: TTL / (ImgH*Tan(Semi-FOV))<1.65.

[0078] Preferably, 0.90 < TTL / (ImgH * Tan(Semi-FOV)) < 1.65.

[0079] By reasonably distributing the optical power of each lens, it is beneficial to balance the aberration generated by the camera lens and greatly improve the imaging quality of the camera lens. The object side of the infrared cut-off filter element is set as an aspherical surface. At the same time, the relationship between the maximum semi-field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side of the first lens to the imaging surface, and half of the diagonal length ImgH of the effective pixel area on the imaging surface is reasonably restricted, so that the infrared cut-off filter element and the optical system of the entire camera lens are optimized synchronously. While ensuring that the size of the image plane remains unchanged, when reducing TTL, it is ensured that the performance will not decrease significantly, ensuring good optical performance of the camera lens and meeting the requirements of a large image plane and a small size. At the same time, meeting the requirements of a large field of view angle is beneficial to broaden the shooting view range.

[0080] In this embodiment, the maximum semi-field angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy: 1.8 mm < EPD * Tan(Semi-FOV) < 3.5 mm. Meeting this conditional formula can meet the requirements of a large aperture. A large aperture is beneficial to increasing the light passing aperture of the system, allowing more light to enter the imaging surface, improving the overall picture brightness, and improving the shooting effect under dark night conditions. Preferably, 1.8 mm < EPD * Tan(Semi-FOV) < 3.2 mm.

[0081] In this embodiment, the F number Fno of the camera lens, the on-axis distance TTL from the object side of the first lens to the imaging surface, and the entrance pupil diameter EPD of the camera lens satisfy: 4.0 ≤ Fno * (TTL / EPD) ≤ 4.8. Meeting this conditional formula meets the requirements of a large field of view angle and a large aperture. A large field of view angle is beneficial to broadening the shooting view range, and a large aperture is beneficial to increasing the light passing aperture of the imaging system, allowing more light to enter the image surface, which is beneficial to improving the shooting effect under dark night conditions.

[0082] In this embodiment, the F number Fno of the camera lens, the on-axis distance TTL from the object side of the first lens to the imaging surface, and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: 1.4 < Fno * (ImgH / TTL) < 2.0. Meeting this conditional formula meets the requirements of a small TTL and a large aperture. A small TTL is beneficial to realizing the miniaturization of the camera lens, improving the space utilization rate of the whole machine, reducing the lens protrusion phenomenon, ensuring the beauty of the whole machine, and a large aperture is beneficial to increasing the light passing aperture of the imaging system, allowing more light to enter the image surface, which is beneficial to improving the shooting effect under dark night conditions. Preferably, 1.4 < Fno * (ImgH / TTL) < 1.9.

[0083] In this embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface, half of the diagonal length ImgH of the effective pixel region on the imaging surface, and the effective focal length f of the camera lens satisfy: (TTL / f)*(TTL / ImgH) < 1.60. Satisfying this conditional expression ensures the ultra-thin characteristic of the camera lens, realizes miniaturization, improves the space utilization rate of the whole machine, reduces the protrusion phenomenon of the camera lens, and ensures the aesthetics of the whole machine. Preferably, 1.20 < (TTL / f)*(TTL / ImgH) < 1.60.

[0084] In this embodiment, the effective focal length f of the camera lens and the curvature radius R of the object side surface of the infrared cut-off filter element TP satisfy: 10*f / |R TP | < 1.0. Satisfying this conditional expression can improve the surface shape of the object side surface of the infrared cut-off filter element, reduce the sensitivity of the system to the third lens, and ensure the processing feasibility. Preferably, 10*f / |R TP | < 0.7.

[0085] In this embodiment, the effective focal length f of the camera lens and the effective focal length f TP of the infrared cut-off filter element satisfy: 10*f / |f TP | < 0.5. Satisfying this conditional expression can ensure that the camera lens reduces TTL while effectively controlling the system field curvature and ensuring the imaging quality. Preferably, 10*f / |f TP | < 0.4.

[0086] In this embodiment, the central thickness C TP of the infrared cut-off filter element and the edge thickness E TP at the maximum effective radius of the infrared cut-off filter element satisfy: 0.9 < C TP / E TP ≤ 1.5. Satisfying this conditional expression is beneficial to meeting the processing requirements of the infrared cut-off filter element.

[0087] In this embodiment, the effective focal length f of the camera lens and the effective focal length fi of the negative lens satisfy: -2 < f / fi < -1. Satisfying this conditional expression is beneficial to the reasonable distribution of the optical power of the first lens to the seventh lens in space and is beneficial to reducing the aberration of the camera lens. Preferably, -1.7 < f / fi < -1.1.

[0088] In this embodiment, the effective focal length f of the camera lens, the effective focal length fo of the positive lens, and the effective focal length fi of the negative lens satisfy: -1.0 < f / fo + f / fi < 0. Satisfying this conditional expression is beneficial to the reasonable distribution of the optical power of the first lens to the seventh lens in space and is beneficial to reducing the aberration of the camera lens. Preferably, -0.7 < f / fo + f / fi < -0.1.

[0089] In this embodiment, the effective focal length f of the camera lens and the radius of curvature Ri of the object side surface of the negative lens satisfy: 1.0 < f / Ri < 4.0. Satisfying this conditional expression is beneficial to controlling the shape of the object side surface of the negative lens and meeting the processability requirements. Preferably, 1.1 < f / Ri < 3.6.

[0090] In this embodiment, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 1.5 < R4 / R1 < 4.5. Satisfying this conditional expression is beneficial to controlling the shapes of the first lens and the second lens and meeting the processability requirements. Preferably, 1.7 < R4 / R1 < 4.2.

[0091] In this embodiment, the effective focal length f of the camera lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -3.7 < f1 / f + f2 / f < -0.9. Satisfying this conditional expression is beneficial to the reasonable distribution of the optical powers of the first lens and the second lens in space and is beneficial to reducing the aberration of the camera lens. Preferably, -3.7 < f1 / f + f2 / f < -1.0.

[0092] In this embodiment, the effective focal length f of the camera lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -1.5 < f1 / f + f2 / f < -0.9. Satisfying this conditional expression is beneficial to the reasonable distribution of the optical powers of the first lens and the second lens in space and is beneficial to reducing the aberration of the camera lens.

[0093] In this embodiment, the material of the infrared cut-off filter element is glass. An infrared cut-off film is provided on the object side surface or the image side surface of the infrared cut-off filter element, and the passband of the infrared cut-off filter element is 430 nm to 780 nm. The infrared cut-off film provided on the object side surface or the image side surface of the infrared cut-off filter element ensures that the received light is in the visible light band.

[0094] In this embodiment, the camera lens sequentially includes five lenses with optical powers along the optical axis from the object side to the image side. The five lenses include a first lens with a positive 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, and a fifth lens with a negative optical power. By reasonably distributing the optical powers of each lens, it is beneficial to the reasonable distribution of the optical powers of the first lens to the fifth lens in space and is beneficial to reducing the aberration of the camera lens.

[0095] In this embodiment, the central thickness CT1 of the first lens and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 2.0 < CT1 / T23 < 2.5. Satisfying this conditional expression can ensure the processability of the system and reduce the production cost. Preferably, 1.9 < CT1 / T23 < 3.5.

[0096] In this embodiment, the central thickness CT3 of the third lens and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.5 < CT3 / T45 < 2.0. Satisfying this conditional formula can ensure the processability of the system and reduce the production cost. Preferably, 0.6 < CT3 / T45 < 1.7.

[0097] In this embodiment, the imaging lens sequentially includes seven lenses with optical powers along the optical axis from the object side to the image side. The seven lenses include a first lens with a positive optical power, a second lens with a negative optical power, a third lens with an optical power, a fourth lens with an optical power, a fifth lens with an optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power. By reasonably distributing the optical powers of the respective lenses, it is beneficial to the reasonable distribution of the optical powers of the first lens to the seventh lens in space, and is beneficial to reducing the aberration of the lens.

[0098] In this embodiment, the maximum semi-field angle Semi-FOV of the imaging lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface, and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL / (ImgH*Tan(Semi-FOV) < 1.5. Satisfying this conditional formula meets the requirements of a small TTL and a large field angle. A small TTL is beneficial for the imaging lens to achieve miniaturization, improve the space utilization rate of the whole machine, reduce the protrusion phenomenon of the imaging lens, ensure the aesthetics of the whole machine, and a large aperture is beneficial for broadening the shooting view range.

[0099] In this embodiment, the maximum semi-field angle Semi-FOV of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: 2.5mm < EPD*Tan(Semi-FOV) < 3.5mm. Satisfying this conditional formula meets the requirement of a large aperture. A large aperture is beneficial for increasing the light passing aperture of the imaging system, allowing more light to enter the image surface, enhancing the overall picture brightness, and improving the shooting effect under dark night conditions.

[0100] In this embodiment, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 3.0 < (R12 + R11) / (R12 - R11) < 4.0. Satisfying this conditional formula is beneficial for controlling the shape of the sixth lens and meeting the processability requirements.

[0101] In this embodiment, the central thickness CT6 of the sixth lens and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 1.0 < CT6 / T56 < 1.5. Satisfying this conditional formula can ensure the processability of the system and reduce the production cost.

[0102] Embodiment 2

[0103] like Figures 1 to 35 As shown, the camera lens includes at least five lenses with optical power in sequence from the object side to the image side along the optical axis, the at least five lenses include a first lens with positive optical power, a second lens with negative optical power, a negative lens close to the image side of the at least five lenses, a positive lens adjacent to the object side of the negative lens, and an infrared cutoff filter element, the negative lens has negative optical power; the positive lens has positive optical power; the infrared cutoff filter element is arranged on the object side of the imaging plane, and the object side surface of the infrared cutoff filter element is an aspherical surface; wherein the F number Fno of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging plane, and the entrance pupil diameter EPD of the camera lens satisfy the following: 4.0≤Fno*(TTL / EPD)≤4.8.

[0104] By rationally allocating the focal length of each lens, it is beneficial to balance the aberrations generated by the camera lens and greatly improve the imaging quality of the camera lens. The object side of the infrared cutoff filter element is set to an aspherical surface, so that the infrared cutoff filter element and the optical system of the entire camera lens are optimized synchronously, ensuring that the image size remains unchanged, while reducing TTL, the performance will not be significantly reduced, ensuring good optical performance of the camera lens, and meeting the requirements of large image surface and small size. At the same time, it meets the requirements of large field angle, which is beneficial to widen the shooting range. By constraining the relationship between the F number Fno of the camera lens, the axial distance TTL from the object side of the first lens to the imaging surface, and the entrance pupil diameter EPD of the camera lens, the requirements of large field angle and large aperture are met. The large field angle is conducive to widening the shooting range, and the large aperture is conducive to increasing the aperture of the imaging system, accommodating more light to enter the image surface, which is conducive to improving the shooting effect under dark night conditions.

[0105] In this embodiment, the maximum half field of view angle Semi-FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging surface, and the half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy the following: TTL / (ImgH*Tan(Semi-FOV))<1.65. This conditional expression is satisfied, and while reducing TTL, the performance is not significantly reduced, ensuring good optical performance of the camera lens and meeting the requirements of large image surface and small size. At the same time, meeting the requirements of large field of view angle is conducive to widening the shooting range. Preferably, 0.90 <TTL / (ImgH*Tan(Semi-FOV))<1.65。

[0106] In this embodiment, the relationship between the maximum semi-field of view Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens satisfies: 1.8mm < EPD * Tan(Semi-FOV) < 3.5mm. Meeting this conditional expression can meet the large aperture requirement. A large aperture is beneficial to increasing the light transmission aperture of the system, allowing more light to enter the imaging surface, enhancing the overall picture brightness, and improving the shooting effect under dark night conditions. Preferably, 1.8mm < EPD * Tan(Semi-FOV) < 3.2mm.

[0107] In this embodiment, the relationship between the F-number Fno of the camera lens, the on-axis distance TTL from the object side of the first lens to the imaging surface, and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfies: 1.4 < Fno * (ImgH / TTL) < 2.0. Meeting this conditional expression can meet the requirements of a small TTL and a large aperture. A small TTL is beneficial to miniaturizing the camera lens, improving the overall space utilization rate of the machine, reducing the lens protrusion phenomenon, and ensuring the aesthetics of the whole machine. A large aperture is beneficial to increasing the light transmission aperture of the imaging system, allowing more light to enter the image plane, and is beneficial to improving the shooting effect under dark night conditions. Preferably, 1.4 < Fno * (ImgH / TTL) < 1.9.

[0108] In this embodiment, the relationship between the on-axis distance TTL from the object side of the first lens to the imaging surface, half of the diagonal length ImgH of the effective pixel region on the imaging surface, and the effective focal length f of the camera lens satisfies: (TTL / f) * (TTL / ImgH) < 1.60. Meeting this conditional expression can ensure the ultra-thin characteristic of the camera lens, achieve miniaturization, improve the overall space utilization rate of the machine, reduce the camera lens protrusion phenomenon, and ensure the aesthetics of the whole machine. Preferably, 1.20 < (TTL / f) * (TTL / ImgH) < 1.60.

[0109] In this embodiment, the relationship between the effective focal length f of the camera lens and the curvature radius R of the object side of the infrared cut-off filter element TP satisfies: 10 * f / |R TP | < 1.0. Meeting this conditional expression can improve the surface shape of the object side of the infrared cut-off filter element, reduce the sensitivity of the system to the third lens, and ensure the processing feasibility. Preferably, 10 * f / |R TP | < 0.7.

[0110] In this embodiment, the relationship between the effective focal length f of the camera lens and the effective focal length f of the infrared cut-off filter element TP satisfies: 10 * f / |f TP | < 0.5. Meeting this conditional expression can ensure that while the camera lens reduces the TTL, it effectively controls the field curvature of the system and ensures the imaging quality. Preferably, 10 * f / |f TP | < 0.4.

[0111] In this embodiment, the central thickness C of the infrared cut-off filter element TP and the edge thickness E of the infrared cut-off filter element at the maximum effective radius TP satisfy: 0.9 < C TP / E TP ≤ 1.5. Satisfying this conditional expression is beneficial to meeting the processing requirements of the infrared cut-off filter element.

[0112] In this embodiment, the effective focal length f of the imaging lens and the effective focal length fi of the negative lens satisfy: -2 < f / fi < -1. Satisfying this conditional expression is beneficial to the reasonable spatial distribution of the optical power of the first lens to the seventh lens and is beneficial to reducing the aberration of the imaging lens. Preferably, -1.7 < f / fi < -1.1.

[0113] In this embodiment, the effective focal length f of the imaging lens, the effective focal length fo of the positive lens, and the effective focal length fi of the negative lens satisfy: -1.0 < f / fo + f / fi < 0. Satisfying this conditional expression is beneficial to the reasonable spatial distribution of the optical power of the first lens to the seventh lens and is beneficial to reducing the aberration of the imaging lens. Preferably, -0.7 < f / fo + f / fi < -0.1.

[0114] In this embodiment, the effective focal length f of the imaging lens and the radius of curvature Ri of the object side surface of the negative lens satisfy: 1.0 < f / Ri < 4.0. Satisfying this conditional expression is beneficial to controlling the shape of the object side surface of the negative lens and meeting the processing requirements. Preferably, 1.1 < f / Ri < 3.6.

[0115] In this embodiment, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 1.5 < R4 / R1 < 4.5. Satisfying this conditional expression is beneficial to controlling the shapes of the first lens and the second lens and meeting the processing requirements. Preferably, 1.7 < R4 / R1 < 4.2.

[0116] In this embodiment, the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -3.7 < f1 / f + f2 / f < -0.9. Satisfying this conditional expression is beneficial to the reasonable spatial distribution of the optical power of the first lens and the second lens and is beneficial to reducing the aberration of the imaging lens. Preferably, -3.7 < f1 / f + f2 / f < -1.0.

[0117] In this embodiment, the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -1.5 < f1 / f + f2 / f < -0.9. Satisfying this conditional expression is beneficial to the reasonable spatial distribution of the optical power of the first lens and the second lens and is beneficial to reducing the aberration of the imaging lens.

[0118] In this embodiment, the material of the infrared cut-off filter element is glass. An infrared cut-off film is provided on the object side or the image side of the infrared cut-off filter element. The passband of the infrared cut-off filter element is 430 nm to 780 nm. An infrared cut-off film is provided on the object side or the image side of the infrared cut-off filter element to ensure that the received light is in the visible light band.

[0119] In this embodiment, the imaging lens sequentially includes five lenses with optical powers along the optical axis from the object side to the image side. The five lenses include a first lens with a positive 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, and a fifth lens with a negative optical power. By reasonably distributing the optical powers of the respective lenses, it is beneficial to the reasonable distribution of the optical powers of the first lens to the fifth lens in space and is beneficial to reducing the aberration of the imaging lens.

[0120] In this embodiment, the center thickness CT1 of the first lens and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 2.0 < CT1 / T23 < 2.5. Satisfying this conditional formula can ensure the processability of the system and reduce the production cost. Preferably, 1.9 < CT1 / T23 < 3.5.

[0121] In this embodiment, the center thickness CT3 of the third lens and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.5 < CT3 / T45 < 2.0. Satisfying this conditional formula can ensure the processability of the system and reduce the production cost. Preferably, 0.6 < CT3 / T45 < 1.7.

[0122] In this embodiment, the imaging lens sequentially includes seven lenses with optical powers along the optical axis from the object side to the image side. The seven lenses include a first lens with a positive optical power, a second lens with a negative optical power, a third lens with an optical power, a fourth lens with an optical power, a fifth lens with an optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power. By reasonably distributing the optical powers of the respective lenses, it is beneficial to the reasonable distribution of the optical powers of the first lens to the seventh lens in space and is beneficial to reducing the aberration of the lens.

[0123] In this embodiment, the maximum half field of view Semi-FOV of the imaging lens, the on-axis distance TTL from the object side of the first lens to the imaging surface, and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL / (ImgH * Tan(Semi-FOV)) < 1.5. Satisfying this conditional formula meets the requirements of a small TTL and a large field of view. A small TTL is beneficial for the imaging lens to achieve miniaturization, improve the space utilization rate of the whole machine, reduce the protrusion phenomenon of the imaging lens, ensure the aesthetics of the whole machine, and a large aperture is beneficial for broadening the shooting view range.

[0124] In this embodiment, the following condition is satisfied between the maximum semi-field of view Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens: 2.5mm < EPD * Tan(Semi-FOV) < 3.5mm. Satisfying this conditional formula meets the large aperture requirement. A large aperture is beneficial to increasing the light passing aperture of the imaging system, allowing more light to enter the image plane, enhancing the overall picture brightness, and improving the shooting effect under dark night conditions.

[0125] In this embodiment, the following condition is satisfied between the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens: 3.0 < (R12 + R11) / (R12 - R11) < 4.0. Satisfying this conditional formula is beneficial to controlling the shape of the sixth lens and meeting the processing requirement.

[0126] In this embodiment, the following condition is satisfied between the central thickness CT6 of the sixth lens and the air gap T56 between the fifth lens and the sixth lens on the optical axis: 1.0 < CT6 / T56 < 1.5. Satisfying this conditional formula can ensure the processability of the system and reduce the production cost.

[0127] Optionally, the above camera lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the image plane.

[0128] The camera lens in this application can adopt multiple lenses, such as at least five of the above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial distance between each lens, etc., the aperture of the camera lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the camera lens more conducive to production and processing and applicable to portable electronic devices such as smart phones. The above camera lens also has the advantages of a large aperture, a large field of view, being ultra-thin, and having good imaging quality, and can meet the requirements of miniaturization of intelligent electronic products.

[0129] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0130] 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 camera lens can be changed to obtain the various results and advantages described in this specification. For example, although at least five lenses are described as an example in the embodiments, the camera lens is not limited to including at least five lenses. If necessary, the camera lens may also include other numbers of lenses.

[0131] The following further describes examples of specific surface shapes and parameters of the camera lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0132] It should be noted that any one of the following examples 1 to 7 is applicable to all embodiments of the present application.

[0133] Example 1

[0134] like Figures 1 to 5 As shown, the camera lens of Example 1 of the present application is described. Figure 1 A schematic diagram showing the structure of a camera lens of Example 1 is shown.

[0135] like Figure 1 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared cutoff filter element E8 and an imaging surface S17.

[0136] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave. The infrared cut filter element E8 has an object side surface S15 and an image side surface S16, and the object side surface S15 of the infrared cut filter element is a convex surface. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0137] In this example, the total effective focal length f of the imaging lens is 6.49 mm, the F number Fno of the imaging lens is 1.98, and the image height ImgH is 6.25 mm.

[0138] Table 1 shows a basic structural parameter table of the camera lens of Example 1, wherein the units of the curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0139]

[0140]

[0141] Table 1

[0142] In Example 1, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0143]

[0144] 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 (i.e., 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 2 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each aspheric mirror surface S1-S15 in Example 1.

[0145]

[0146]

[0147] Table 2

[0148] Figure 2 The axial chromatic aberration curve of the camera lens of Example 1 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths passing through the camera lens. Figure 3 The astigmatism curve of the imaging lens of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 4 The distortion curve of the camera lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 5 The chromatic aberration curve of the camera lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0149] according to Figures 2 to 5 It can be seen that the camera lens given in Example 1 can achieve good imaging quality.

[0150] Example 2

[0151] like Figures 6 to 10 As shown, the camera lens of Example 2 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Figure 6 A schematic diagram of the camera lens structure of Example 2 is shown.

[0152] like Figure 6 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared cutoff filter element E8 and an imaging surface S17.

[0153] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave. The infrared cut filter element E8 has an object side surface S15 and an image side surface S16, and the object side surface S15 of the infrared cut filter element is a convex surface. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0154] In this example, the total effective focal length f of the imaging lens is 6.51 mm, the F number Fno of the imaging lens is 1.98, and the image height ImgH is 6.43 mm.

[0155] Table 3 shows a basic structural parameter table of the camera lens of Example 2, wherein the units of the curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0156]

[0157]

[0158] Table 3

[0159] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0160]

[0161]

[0162] Table 4

[0163] Figure 7 The axial chromatic aberration curve of the camera lens of Example 2 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the camera lens. Figure 8 The astigmatism curve of the imaging lens of Example 2 is shown, which indicates the meridional image curvature and the sagittal image curvature. Fig. 9 The distortion curve of the camera lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.10 The chromatic aberration curve of the camera lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0164] according to Figures 7 to 10 It can be seen that the camera lens provided in Example 2 can achieve good imaging quality.

[0165] Example 3

[0166] like Figures 11 to 15 As shown, the camera lens of Example 3 of the present application is described. Fig.11 A schematic diagram of the camera lens structure of Example 3 is shown.

[0167] like Fig.11 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared cutoff filter element E8 and an imaging surface S17.

[0168] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave. The infrared cut filter element E8 has an object side surface S15 and an image side surface S16, and the object side surface S15 of the infrared cut filter element is a convex surface. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0169] In this example, the total effective focal length f of the imaging lens is 6.28 mm, the F number Fno of the imaging lens is 1.87, and the image height ImgH is 6.25 mm.

[0170] Table 5 shows a basic structural parameter table of the camera lens of Example 3, wherein the units of the curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0171]

[0172]

[0173] Table 5

[0174] Table 6 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1.

[0175]

[0176]

[0177] Table 6

[0178] Fig.12 The axial chromatic aberration curve of the camera lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point after passing through the camera lens. Fig.13 The astigmatism curve of the imaging lens of Example 3 is shown, which indicates the meridional image curvature and the sagittal image curvature. Fig.14The distortion curve of the camera lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.15 The magnification chromatic aberration curve of the camera lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0179] according to Figures 12 to 15 It can be seen that the camera lens given in Example 3 can achieve good imaging quality.

[0180] Example 4

[0181] like Figures 16 to 20 As shown, the camera lens of Example 4 of the present application is described. Fig.16 A schematic diagram showing the structure of a camera lens of Example 4 is shown.

[0182] like Fig.16 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared cutoff filter element E7 and an imaging surface S15.

[0183] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The infrared cutoff filter element E7 has an object side surface S13 of the infrared cutoff filter element and an image side surface S14 of the infrared cutoff filter element, and the object side surface S13 of the infrared cutoff filter element is concave. Light from an object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15 .

[0184] In this example, the total effective focal length f of the imaging lens is 4.53 mm, the F number Fno of the imaging lens is 1.98, and the image height ImgH is 5.29 mm.

[0185] Table 7 shows a basic structural parameter table of the camera lens of Example 4, wherein the units of the curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0186]

[0187]

[0188] Table 7

[0189] Table 8 shows the high-order coefficients that can be used for each aspheric mirror surface in Example 4, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0190]

[0191]

[0192] Table 8

[0193] Fig.17 The axial chromatic aberration curve of the camera lens of Example 4 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the camera lens. Fig.18 The astigmatism curve of the imaging lens of Example 4 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig.19 The distortion curve of the camera lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig. 20 The chromatic aberration curve of the camera lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0194] according to Figures 17 to 20 It can be seen that the camera lens given in Example 4 can achieve good imaging quality.

[0195] Example 5

[0196] like Figure 21 to Figure 25 As shown, the camera lens of Example 5 of the present application is described. Fig.21 A schematic diagram showing the structure of a camera lens of Example 5 is shown.

[0197] like Fig.21 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, an infrared cutoff filter element E6 and an imaging surface S13.

[0198] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The infrared cutoff filter element E6 has an object side surface S11 of the infrared cutoff filter element and an image side surface S12 of the infrared cutoff filter element, and the object side surface S11 of the infrared cutoff filter element is concave. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0199] In this example, the total effective focal length f of the imaging lens is 4.29 mm, the F number Fno of the imaging lens is 1.90, and the image height ImgH is 3.74 mm.

[0200] Table 9 shows a basic structural parameter table of the camera lens of Example 5, wherein the units of the curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0201]

[0202]

[0203] Table 9

[0204] Table 10 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 5.

[0205]

[0206] Table 10

[0207] Fig. 22 The axial chromatic aberration curve of the camera lens of Example 5 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the camera lens. Fig.23 The astigmatism curve of the imaging lens of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig.24 The distortion curve of the camera lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.25 The chromatic aberration curve of the camera lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0208] according to Figure 22 to Figure 25It can be seen that the camera lens given in Example 5 can achieve good imaging quality.

[0209] Example 6

[0210] like Figures 26 to 30 As shown, the camera lens of Example 6 of the present application is described. Fig.26 A schematic diagram showing the structure of a camera lens of Example 6 is shown.

[0211] like Fig.26 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, an infrared cutoff filter element E6 and an imaging surface S13.

[0212] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The infrared cutoff filter element E6 has an object side surface S11 of the infrared cutoff filter element and an image side surface S12 of the infrared cutoff filter element, and the object side surface S11 of the infrared cutoff filter element is convex. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0213] In this example, the total effective focal length f of the imaging lens is 4.37 mm, the F number Fno of the imaging lens is 1.94, and the image height ImgH is 3.70 mm.

[0214] Table 11 shows a basic structural parameter table of the camera lens of Example 6, wherein the units of curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0215]

[0216] Table 11

[0217] Table 12 shows the high-order coefficients that can be used for each aspheric mirror surface in Example 6, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0218]

[0219]

[0220] Table 12

[0221] Fig. 27 The axial chromatic aberration curve of the camera lens of Example 6 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the camera lens. Fig.28 The astigmatism curve of the imaging lens of Example 6 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig.29 The distortion curve of the camera lens of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.30 The chromatic aberration curve of the camera lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0222] according to Figures 27 to 30 It can be seen that the camera lens given in Example 6 can achieve good imaging quality.

[0223] Example 7

[0224] like Figure 31 to Figure 35 As shown, the camera lens of Example 7 of the present application is described. Fig.31 A schematic diagram showing the structure of a camera lens of Example 7 is shown.

[0225] like Fig.31 As shown, the camera lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, an infrared cutoff filter element E6 and an imaging surface S13.

[0226] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The infrared cutoff filter element E6 has an object side surface S11 of the infrared cutoff filter element and an image side surface S12 of the infrared cutoff filter element, and the object side surface S11 of the infrared cutoff filter element is convex. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0227] In this example, the total effective focal length f of the imaging lens is 4.36 mm, the F number Fno of the imaging lens is 1.94, and the image height ImgH is 3.74 mm.

[0228] Table 13 shows a basic structural parameter table of the camera lens of Example 7, wherein the units of the curvature radius, thickness / distance, focal length and effective radius are all millimeters (mm).

[0229]

[0230] Table 13

[0231] Table 14 shows the high-order coefficients that can be used for each aspheric mirror surface in Example 7, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0232]

[0233]

[0234] Table 14

[0235] Fig.32 The axial chromatic aberration curve of the camera lens of Example 7 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the camera lens. Fig.33 The astigmatism curve of the imaging lens of Example 7 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig.34 The distortion curve of the camera lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.35 The magnification chromatic aberration curve of the camera lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the camera lens.

[0236] according to Figure 32 to Figure 35 It can be seen that the camera lens given in Example 7 can achieve good imaging quality.

[0237] In summary, Examples 1 to 7 respectively satisfy the relationships shown in Table 15.

[0238] Conditional / Example 1 2 3 4 5 6 7 TTL / (ImgH*Tan(Semi-FOV) 1.27 1.21 1.34 0.93 1.58 1.63 1.64 EPD*Tan(Semi-FOV) 3.10 3.16 3.00 2.59 1.91 1.88 1.87 Fno*(TTL / EPD) 4.54 4.52 4.14 4.79 4.22 4.35 4.40 Fno*(ImgH / TTL) 1.65 1.70 1.56 1.88 1.41 1.43 1.43 (TTL / f)*(TTL / ImgH) 1.39 1.34 1.42 1.29 1.57 1.57 1.59 <![CDATA[10*f / |R TP |]]> 0.62 0.19 0.25 0.33 0.23 0.31 0.08 <![CDATA[10*f / |f TP |]]> 0.32 0.10 0.13 0.17 0.12 0.16 0.04 <![CDATA[C TP / AND TP ]]> 1.46 1.14 1.01 1.13 0.96 0.98 0.99 f / fi -1.15 -1.16 -1.11 -1.34 -1.61 -1.64 -1.63 f / fo+f / fi -0.66 -0.63 -0.61 -0.13 -0.44 -0.45 -0.45 f / Ri 1.20 1.20 1.16 2.88 3.50 3.56 3.57 R4 / R1 1.81 1.77 1.78 4.19 3.47 3.49 3.46 f1 / f+f2 / f -1.48 -1.42 -1.39 -3.67 -1.06 -0.98 -1.05 CT1 / T23 1.95 1.93 1.92 3.41 2.27 2.27 2.19 CT3 / T45 0.70 0.69 0.70 1.53 1.62 1.62 1.64 (R12+R11) / (R12-R11) 3.75 3.34 3.33 CT6 / T56 1.20 1.15 1.18

[0239] Table 15

[0240] Table 16 gives the effective focal length f of the camera lenses of Examples 1 to 7, the effective focal length f1 to f5 of each lens, etc.

[0241]

[0242]

[0243] Table 16

[0244] 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 camera lens described above.

[0245] 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.

[0246] 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.

[0247] 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.

[0248] 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. A camera lens, characterized in that: The optical axis includes seven lenses having optical power from the object side to the image side in sequence, and the seven lenses include: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex and the image-side surface is concave; a second lens having negative optical power, wherein the object-side surface of the second lens is convex and the image-side surface is concave; a third lens having negative optical power, wherein the object side surface of the third lens is a concave surface; a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex and the image-side surface is concave; a fifth lens having positive refractive power, wherein the object-side surface of the fifth lens is convex and the image-side surface is concave; a sixth lens having positive refractive power, wherein the object-side surface of the sixth lens is convex and the image-side surface is concave; a seventh lens having negative optical power, wherein the object-side surface of the seventh lens is concave and the image-side surface is concave; An infrared cut-off filter element, wherein the infrared cut-off filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut-off filter element is an aspherical surface; the camera lens is composed of the seven lenses and the infrared cut-off filter element; Among them, the F number Fno of the camera lens, the axial distance TTL from the object side surface of the first lens to the imaging surface, and the entrance pupil diameter EPD of the camera lens satisfy: 4.14≤Fno*(TTL / EPD)≤4.54; the effective focal length f of the camera lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -0.66≤f / f6+f / f7≤-0.61; the effective focal length f of the camera lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -1.48≤f1 / f+f2 / f≤-1.

39.

2. The imaging lens according to claim 1, wherein: The maximum half field of view angle Semi-FOV of the camera lens, the axial distance TTL from the object side of the first lens to the imaging plane, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following conditions: 1.21≤TTL / (ImgH*Tan(Semi-FOV))≤1.34; the maximum half field of view angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens satisfy the following conditions: 3.00mm≤EPD*Tan(Semi-FOV)≤3.16mm.

3. The imaging lens according to claim 1, wherein: The F number Fno of the camera lens, the axial distance TTL from the object side of the first lens to the imaging plane, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following: 1.56≤Fno*(ImgH / TTL)≤1.

70.

4. The imaging lens according to claim 1, wherein: The axial distance TTL from the object side of the first lens to the imaging plane, half of the diagonal length of the effective pixel area on the imaging plane ImgH, and the effective focal length f of the camera lens satisfy the following relationship: 1.34≤(TTL / f)*(TTL / ImgH)≤1.

42.

5. The imaging lens according to claim 1, wherein: The effective focal length f of the camera lens and the curvature radius R of the object side of the infrared cutoff filter element TP Satisfy between: 0.19≤10*f / |R TP |≤0.

62.

6. The imaging lens according to claim 1, wherein: The effective focal length f of the camera lens and the effective focal length f of the infrared cutoff filter element TP Satisfy between: 0.10≤10*f / |f TP |≤0.

32.

7. The imaging lens according to claim 1, wherein: The central thickness C of the infrared cutoff filter element TP The edge thickness E of the infrared cutoff filter element at the maximum effective radius TP Between: 1.01≤C TP / E TP ≤1.

46.

8. The imaging lens according to claim 1, wherein: The effective focal length f of the camera lens and the effective focal length f7 of the seventh lens satisfy the following: -1.16≤f / f7≤-1.

11.

9. The imaging lens according to claim 1, wherein: The effective focal length f of the camera lens and the curvature radius R14 of the image side surface of the seventh lens satisfy the following relationship: 1.16≤f / R14≤1.

20.

10. The imaging lens according to claim 1, wherein: A curvature radius R1 of the object-side surface of the first lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 1.77≤R4 / R1≤1.

81.

11. The imaging lens according to claim 1, wherein: The infrared cut-off filter element is made of glass, an infrared cut-off film is arranged on the object side or the image side of the infrared cut-off filter element, and the passband of the infrared cut-off filter element is 430nm~780nm.

12. The imaging lens according to claim 1, wherein: A center thickness CT1 of the first lens and an air interval T23 between the second lens and the third lens on the optical axis satisfy: 1.92≤CT1 / T23≤1.

95.

13. The imaging lens according to claim 1, wherein: A center thickness CT3 of the third lens and an air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy the following ratio: 0.69≤CT3 / T45≤0.

70.

14. The imaging lens according to claim 1, wherein: A curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens satisfy the following relationship: 3.33≤(R12+R11) / (R12-R11)≤3.

75.

15. The imaging lens according to claim 1, wherein: A center thickness CT6 of the sixth lens and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy the following: 1.15≤CT6 / T56≤1.20.

Images