A video imaging lens

Abstract

The present application relates to the field of imaging lens, and more particularly to a video imaging lens, sequentially comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens along an optical axis from an object side to an image side; each of the first lens to the fifth lens comprises an object side surface facing the object side and passing imaging light and an image side surface facing the image side and passing imaging light; the first lens has negative refractive power; the second lens has positive refractive power; the third lens has positive refractive power; the fourth lens has negative refractive power; the fifth lens has positive refractive power; and meets the following conditional expressions: TTL≤14.3mm, TTL / F<6.66, wherein the TTL is the total optical length of the lens, and the F is the light aperture of the lens; the video imaging lens has a full view angle MTF greater than 0.32 when the spatial frequency reaches 112 lp / mm, and has a good imaging effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of imaging lens, in particular to a video imaging lens. BACKGROUND

[0002] With the development of wireless technology, wireless transmission technology is more and more accepted by various industries. Wireless image transmission as a special use is also gradually favored by the majority of users and widely used in work and life. Video conference plays an important role in work. The existing video lens has a large outer diameter, and the small size video lens has poor imaging effect. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application provides a video imaging lens which can solve the technical problems of large outer diameter of video lens and poor effect.

[0004] To solve the above technical problems, the present application provides the following technical scheme:

[0005] A video imaging lens, characterized in that, from the object side to the image side along an optical axis, it comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence; the first lens to the fifth lens each comprises an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through;

[0006] The first lens has a negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;

[0007] The second lens has a positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface;

[0008] The third lens has a positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;

[0009] The fourth lens has a negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface;

[0010] The fifth lens has a positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;

[0011] And meet the following conditional formula:

[0012] TTL≤14.3mm, TTL / F<6.66,

[0013] The TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and the F is the light aperture of the lens.

[0014] Further, the first lens, the second lens, the fourth lens and the fifth lens are plastic aspherical lenses, the third lens is a glass spherical lens, and a diaphragm is arranged between the second lens and the third lens.

[0015] Furthermore, it meets the following conditional expressions: f1 < |20|, f2 < |70|, f3 < |20|, f4 < |20|, f5 < |20|, where f1 to f5 are the focal lengths of the first lens to the fifth lens respectively.

[0016] Furthermore, it meets the following conditional expressions: 1 < |f1 / f| < 8, 2 < |f2 / f| < 20, 0 < |f3 / f| < 8, 0 < |f4 / f| < 8, 1 < |f5 / f| < 10, where f1 to f5 are the focal lengths of the first lens to the fifth lens respectively, and f is the focal length of the lens.

[0017] Furthermore, it meets the following conditional expressions: 1.50 < nd1 < 1.70, 1.5 < nd2 < 1.9, 1.5 < nd3 < 1.7, 1.6 < nd4 < 1.8, 1.5 < nd5 < 1.7, where nd1 to nd5 are the refractive indices of the first lens to the fifth lens respectively.

[0018] Furthermore, it meets the following conditional expressions: 50 < vd1 < 70, 15 < vd2 < 60, 50 < vd3 < 75, 15 < vd4 < 30, 50 < vd5 < 70, where vd1 to vd5 are the Abbe numbers of the first lens to the fifth lens respectively.

[0019] Furthermore, it meets the following conditional expression: 120 < vd1 + vd2 + vd3 < 185, where vd1 to vd3 are the Abbe numbers of the first lens to the third lens respectively.

[0020] Furthermore, it meets the following conditional expression: TTL / AAG ≤ 6.0, where AAG is the sum of four air gaps on the optical axis between the first lens and the fifth lens.

[0021] Furthermore, it meets the following conditional expression: ALT < 7.8, where ALT = CT1 + CT2 + CT3 + CT4 + CT5, and CT1 to CT5 are the central thicknesses of the first lens to the fifth lens respectively.

[0022] The beneficial effects of the present invention are as follows:

[0023] This solution adopts a design combining one glass spherical lens and four plastic aspherical lenses, making the maximum luminous flux F of the video imaging lens 2.15, increasing the luminous flux of the lens, improving the imaging brightness, controlling the overall optical length to be 14.3 mm, with an outer diameter less than 8 mm, a relatively small overall volume, and more convenient installation and use. At the same time, when the spatial frequency of the video imaging lens reaches 112 lp / mm, the full-angle MTF is greater than 0.32, having a good imaging effect. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 The optical path diagram of the video imaging lens described in Embodiment 1 of the present invention;

[0026] Figure 2 MTF curve of the video imaging lens described in Embodiment 1 of the present invention;

[0027] Figure 3 Defocus curve of the video imaging lens described in Embodiment 1 of the present invention;

[0028] Figure 4 The relative illumination curve of the video imaging lens described in Embodiment 1 of the present invention;

[0029] Figure 5 The longitudinal chromatic aberration curve of the video imaging lens described in Embodiment 1 of the present invention;

[0030] Figure 6 Field curvature and distortion diagram of the video imaging lens described in Embodiment 1 of the present invention;

[0031] Figure 7 Optical path diagram of the video imaging lens described in Embodiment 2 of the present invention;

[0032] Figure 8 MTF curve of the video imaging lens described in Embodiment 2 of the present invention;

[0033] Figure 9 Defocus curve of the video imaging lens described in Embodiment 2 of the present invention;

[0034] Figure 10 The relative illumination curve of the video imaging lens described in Embodiment 2 of the present invention;

[0035] Figure 11 The longitudinal chromatic aberration curve of the video imaging lens described in Embodiment 2 of the present invention;

[0036] Figure 12 Field curvature and distortion diagram of the video imaging lens described in Embodiment 2 of the present invention;

[0037] Figure 13 Optical path diagram of the video imaging lens described in Embodiment 3 of the present invention;

[0038] Figure 14MTF curve of the video imaging lens described in Embodiment 3 of the present invention;

[0039] Figure 15 Defocus curve of the video imaging lens described in Embodiment 3 of the present invention;

[0040] Figure 16 The relative illumination curve of the video imaging lens described in Embodiment 3 of the present invention;

[0041] Figure 17 The longitudinal chromatic aberration curve of the video imaging lens described in Embodiment 3 of the present invention;

[0042] Figure 18 Field curvature and distortion diagram of the video imaging lens described in Embodiment 3 of the present invention.

[0043] Explanation of main component symbols

[0044] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Aperture stop; 7. Protective plate; 8. Imaging plane. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please refer to Figures 1-18 The present invention provides a video imaging lens, which includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 sequentially along an optical axis from the object side to the image side; each of the first lens 1 to the fifth lens 5 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through; the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture stop 6 is provided between the second lens 2 and the third lens 3.

[0047] The first lens 1 has negative optical power, with the object side being convex and the image side being concave;

[0048] The second lens 2 has a positive optical power, the object side is concave, and the image side is convex;

[0049] The third lens 3 has a positive optical power, the object side is convex, and the image side is convex;

[0050] The fourth lens 4 has a negative optical power, the object side is concave, and the image side is convex;

[0051] The fifth lens 5 has a positive optical power, the object side is convex, and the image side is convex;

[0052] Preferably, and meeting the following conditional expressions: TTL ≤ 14.3 mm, TTL / F < 6.66, where TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, and F is the clear aperture of the lens. The overall structure is compact, enabling miniaturization and having higher practicality.

[0053] Preferably meeting the following conditional expressions, f1 < |20|, f2 < |70|, f3 < |20|, f4 < |20|, f5 < |20|, where f1 to f5 are the focal lengths of the first lens 1 to the fifth lens 5 respectively. By controlling the focal lengths of different lenses, the optical power distribution is made uniform, which is beneficial for correcting temperature drift.

[0054] Preferably, meeting the following conditional expressions, 1 < |f1 / f| < 8, 2 < |f2 / f| < 20, 0 < |f3 / f| < 8, 0 < |f4 / f| < 8, 1 < |f5 / f| < 10, where f1 to f5 are the focal lengths of the first lens 1 to the fifth lens 5 respectively, and f is the focal length of the lens.

[0055] Preferably, meeting the following conditional expressions, 50 < vd1 < 70, 15 < vd2 < 60, 50 < vd3 < 75, 15 < vd4 < 30, 50 < vd5 < 70, where vd1 to vd5 are the Abbe numbers of the first lens 1 to the fifth lens 5 respectively. Meeting the following conditional expressions, 1.50 < nd1 < 1.70, 1.5 < nd2 < 1.9, 1.5 < nd3 < 1.7, 1.6 < nd4 < 1.8, 1.5 < nd5 < 1.7, where nd1 to nd5 are the refractive indices of the first lens 1 to the fifth lens 5 respectively. By controlling the refractive indices and Abbe numbers of the first lens 1 and the second lens 2, and using materials with low refractive indices and high Abbe numbers, off-axis magnification chromatic aberration, astigmatism and other aberrations can be better corrected.

[0056] Preferably, meeting the following conditional expressions, 120 < vd1 + vd2 + vd3 < 185, where vd1 to vd3 are the Abbe numbers of the first lens 1 to the third lens 3 respectively.

[0057] Preferably, the following condition is met: TTL / AAG ≤ 6.0, where AAG is the sum of the four air gaps on the optical axis between the first lens 1 and the fifth lens 5. By controlling the ratio of optical length to air gap, the optical power between each lens can be better allocated, the field curvature of the lens can be controlled, and the image quality can be improved.

[0058] Preferably, the following condition is met: ALT < 7.8, where ALT = CT1 + CT2 + CT3 + CT4 + CT5, and CT1 to CT5 are the center thicknesses of the first lens 1 to the fifth lens 5, respectively. Controlling the lens thickness of the first lens 1 to the fifth lens 5 can better distribute the lens power and improve the lens image quality.

[0059] The video imaging lens of the present invention will now be described in detail with reference to specific embodiments.

[0060] Example 1

[0061] Please refer to Figures 1-6 The present invention provides a video imaging lens, which includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 sequentially along an optical axis from the object side to the image side; each of the first lens 1 to the fifth lens 5 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through; the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture stop 6 is provided between the second lens 2 and the third lens 3.

[0062] The first lens 1 has negative optical power, with the object side being convex and the image side being concave;

[0063] The second lens 2 has positive optical power, with a concave object side and a convex image side;

[0064] The third lens 3 has positive optical power, and the object side and the image side are both convex.

[0065] The fourth lens 4 has negative optical power, with a concave object side and a convex image side;

[0066] The fifth lens 5 has positive optical power, and both the object-side and image-side surfaces are convex.

[0067] Detailed optical data for this specific embodiment are shown in Table 1.

[0068] Table 1 Detailed optical data for Example 1

[0069]

[0070] In this specific embodiment, the first lens 1, the second lens 2, the fourth lens 4, and the fifth lens 5 are all plastic aspherical lenses. For a detailed description of the aspherical nature of the first lens 1, the second lens 2, the fourth lens 4, and the fifth lens 5, please refer to Table 2 below:

[0071] Table 2: Aspheric coefficients

[0072]

[0073]

[0074] The focal length of the video imaging lens described in this embodiment is 14.3mm (TTL), with an outer diameter of less than 8mm, making it smaller in size and easier to install and use; the F-axis is 2.15, which increases the amount of light entering the lens and improves the image brightness; the IMH is 6.388mm, where IMH is the half-image height of the lens, that is, half of the maximum image height of the lens.

[0075] In this specific embodiment, please refer to the attached optical path diagram of the video imaging lens. Figure 1 Please refer to the attached diagram for the MTF curves of the video imaging lens disclosed in this embodiment at different focal lengths in the visible light 435nm-660nm band. Figure 2 As can be seen from the figure, the video imaging lens described in this embodiment has an MTF greater than 0.52 across the entire viewing angle when the spatial frequency reaches 112 lp / mm, exhibiting good imaging performance and meeting users' high-definition requirements. Please refer to the attached figure for the defocus curve of the video imaging lens in the visible light 435nm-660nm band. Figure 3 Different curves represent defocus curves in the meridional and sagittal directions under different fields of view, as indicated by the attached curves. Figure 3 As can be seen, the peaks of almost all curves are near the zero-offset vertical axis, indicating that the defocusing characteristics of the video imaging lens are excellent, resulting in a larger effective depth of focus range. Please refer to the appendix for the relative illumination diagram of the video imaging lens in the visible light 435nm-660nm band disclosed in this embodiment. Figure 4 , by appendix Figure 4 As can be seen, at the maximum field of view, RI > 46%, indicating high relative illumination, high image uniformity, and good imaging effect. Please refer to the appendix for the longitudinal chromatic aberration curve of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. Figure 5 , by appendix Figure 5 It can be seen that the maximum longitudinal chromatic aberration of the video imaging lens operating in the visible light band is 0.05mm, indicating that the lateral and longitudinal chromatic aberrations of this optical lens are well corrected. Please refer to the appendix for the field curvature distortion curves of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. Figure 6 , by appendix Figure 6It can be seen that the optical distortion of the video imaging lens is less than 6%, resulting in good image quality and reducing the difficulty of post-correction.

[0076] Example 2

[0077] Please refer to Figures 7-12 The present invention provides a video imaging lens, which includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 sequentially along an optical axis from the object side to the image side; each of the first lens 1 to the fifth lens 5 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through; the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture stop 6 is provided between the second lens 2 and the third lens 3.

[0078] The first lens 1 has negative optical power, with the object side being convex and the image side being concave;

[0079] The second lens 2 has positive optical power, with a concave object side and a convex image side;

[0080] The third lens 3 has positive optical power, and the object side and the image side are both convex.

[0081] The fourth lens 4 has negative optical power, with a concave object side and a convex image side;

[0082] The fifth lens 5 has positive optical power, and both the object-side and image-side surfaces are convex.

[0083] Detailed optical data for this specific embodiment are shown in Table 3.

[0084] Table 3 Detailed optical data for Example 2

[0085]

[0086] In this specific embodiment, the first lens 1, the second lens 2, the fourth lens 4, and the fifth lens 5 are all plastic aspherical lenses. For a detailed description of the aspherical nature of the first lens 1, the second lens 2, the fourth lens 4, and the fifth lens 5, please refer to Table 4 below:

[0087] Table 4: Aspheric Coefficients

[0088]

[0089] The focal length of the video imaging lens described in this embodiment is 14.3mm (TTL), with an outer diameter of less than 8mm, making it smaller in size and easier to install and use; the F-axis is 2.15, which increases the amount of light entering the lens and improves the image brightness; the IMH is 6.388mm, where IMH is the half-image height of the lens, that is, half of the maximum image height of the lens.

[0090] In this specific embodiment, please refer to the attached optical path diagram of the video imaging lens. Figure 7 Please refer to the attached diagram for the MTF curves of the video imaging lens disclosed in this embodiment at different focal lengths in the visible light 435nm-660nm band. Figure 8 As can be seen from the figure, the video imaging lens described in this embodiment has an MTF greater than 0.32 across the entire viewing angle when the spatial frequency reaches 112 lp / mm, exhibiting good imaging performance and meeting users' high-definition requirements. Please refer to the attached figure for the defocus curve of the video imaging lens in the visible light 435nm-660nm band. Figure 9 Different curves represent defocus curves in the meridional and sagittal directions under different fields of view, as indicated by the attached curves. Figure 9 As can be seen, the peak of the curve has a small offset from the zero-offset vertical axis, indicating that the defocusing characteristics of the video imaging lens are excellent, resulting in a larger effective depth of focus range. Please refer to the appendix for the relative illumination diagram of the video imaging lens in the visible light 435nm-660nm band disclosed in this embodiment. Figure 10 , by appendix Figure 10 As can be seen, at the maximum field of view, RI > 48%, indicating high relative illumination, high image uniformity, and good imaging effect. Please refer to the appendix for the longitudinal chromatic aberration curve of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. Figure 11 , by appendix Figure 11 It can be seen that the maximum longitudinal chromatic aberration of the video imaging lens operating in the visible light band is 0.02mm, indicating that the lateral and longitudinal chromatic aberrations of this optical lens are well corrected. Please refer to the appendix for the field curvature distortion curves of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. Figure 12 , by appendix Figure 12 It can be seen that the optical distortion of the video imaging lens is less than 6%, resulting in good image quality and reducing the difficulty of post-correction.

[0091] Example 3

[0092] Please refer to Figures 13-18 The present invention provides a video imaging lens, which includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 sequentially along an optical axis from the object side to the image side; each of the first lens 1 to the fifth lens 5 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through; the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture stop 6 is provided between the second lens 2 and the third lens 3.

[0093] The first lens 1 has negative optical power, with the object side being convex and the image side being concave;

[0094] The second lens 2 has positive optical power, with a concave object side and a convex image side;

[0095] The third lens 3 has positive optical power, and the object side and the image side are both convex.

[0096] The fourth lens 4 has negative optical power, with a concave object side and a convex image side;

[0097] The fifth lens 5 has positive optical power, and both the object-side and image-side surfaces are convex.

[0098] Detailed optical data for this specific embodiment are shown in Table 5.

[0099] Table 5 Detailed optical data for Example 3

[0100]

[0101]

[0102] In this specific embodiment, the first lens 1, the second lens 2, the fourth lens 4, and the fifth lens 5 are all plastic aspherical lenses. For a detailed description of the aspherical nature of the first lens 1, the second lens 2, the fourth lens 4, and the fifth lens 5, please refer to Table 6 below:

[0103] Table 6: Aspheric Coefficients

[0104]

[0105] The focal length of the video imaging lens described in this embodiment is 14.3mm (TTL), with an outer diameter of less than 8mm, making it smaller in size and easier to install and use; the F-axis is 2.15, which increases the amount of light entering the lens and improves the image brightness; the IMH is 6.388mm, where IMH is the half-image height of the lens, that is, half of the maximum image height of the lens.

[0106] In this specific embodiment, please refer to the attached optical path diagram of the video imaging lens. Figure 13 Please refer to the attached diagram for the MTF curves of the video imaging lens disclosed in this embodiment at different focal lengths in the visible light 435nm-660nm band. Figure 14 As can be seen from the figure, the video imaging lens described in this embodiment has an MTF greater than 0.38 across the entire viewing angle when the spatial frequency reaches 112 lp / mm, exhibiting good imaging performance and meeting users' high-definition requirements. Please refer to the attached figure for the defocus curve of the video imaging lens in the visible light 435nm-660nm band. Figure 15 Different curves represent defocus curves in the meridional and sagittal directions under different fields of view, as indicated by the attached curves. Figure 15As can be seen, the peaks of almost all curves are near the zero-offset vertical axis, indicating that the defocusing characteristics of the video imaging lens are excellent, resulting in a larger effective depth of focus range. Please refer to the appendix for the relative illumination diagram of the video imaging lens in the visible light 435nm-660nm band disclosed in this embodiment. Figure 16 , by appendix Figure 16 As can be seen, at the maximum field of view, RI > 42%, indicating high relative illumination, high image uniformity, and good imaging effect. Please refer to the appendix for the longitudinal chromatic aberration curve of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. Figure 17 , by appendix Figure 17 It can be seen that the maximum longitudinal chromatic aberration of the video imaging lens operating in the visible light band is 0.03mm, indicating that the lateral and longitudinal chromatic aberrations of this optical lens are well corrected. Please refer to the appendix for the field curvature distortion curves of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. Figure 18 , by appendix Figure 18 It can be seen that the optical distortion of the video imaging lens is less than 10%, resulting in good image quality and reducing the difficulty of post-correction.

[0107] Table 7 shows the values ​​of relevant important parameters in three embodiments of the present invention:

[0108] Table 7: Key parameters for each embodiment

[0109] Conditional expression Example 1 Example 2 Example 3 TTL / F 6.65 6.65 6.65 f 3.37 3.36 3.5 f1 / f -1.275 -1.875 -1.445 f2 / f 2.733 3.735 16.700 f3 / f 1.558 1.724 0.933 f4 / f -1.512 -1.247 -0.994 f5 / f 1.489 1.207 1.173 vd1+vd2+vd3 183.00 144.7 126.47 AAG 3.629 2.449 3.086 TTL / AAG 3.940 5.839 4.634 ALT 7.053 7.083 7.790

[0110] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0111] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A video imaging lens, characterized in that, It sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens along an optical axis from the object side to the image side; each of the first lens to the fifth lens includes an object side facing the object side and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through; The first lens has a negative optical power, the object side is convex, and the image side is concave; The second lens has a positive optical power, the object side is concave, and the image side is convex; The third lens has a positive optical power, the object side is convex, and the image side is convex; The fourth lens has a negative optical power, the object side is concave, and the image side is convex; The fifth lens has a positive optical power, the object side is convex, and the image side is convex; And it satisfies the following conditional expressions: TTL≤14.3mm, TTL / F<6.66, F≤2.15; The TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, and the F is the aperture of the lens; the outer diameter of the video imaging lens is less than 8mm; f1 is -4.297 and f5 is 5.018, or f1 is -6.300 and f5 is 4.057, or f1 is -5.060 and f5 is 4.107, |f2|<70, |f3|<20, |f4|<20, where f1 to f5 are the focal lengths of the first lens to the fifth lens respectively.

2. The video imaging lens according to claim 1, characterized in that: The first lens, the second lens, the fourth lens, and the fifth lens are all plastic aspherical lenses, the third lens is a glass spherical lens, and an aperture stop is provided between the second lens and the third lens.

3. The video imaging lens according to claim 1, characterized in that: It satisfies the following conditional expressions, 1<|f1 / f|<8, 2<|f2 / f|<20, 0<|f3 / f|<8, 0<|f4 / f|<8, 1<|f5 / f|<10, where f1 to f5 are the focal lengths of the first lens to the fifth lens respectively, and f is the focal length of the lens.

4. The video imaging lens according to claim 1, characterized in that: It satisfies the following conditional expressions, 1.50<nd1<1.70, 1.5<nd2<1.9, 1.5<nd3<1., 1.6<nd4<1.8, 1.<<nd5<1.7, where nd1 to nd5 are the refractive indices of the first lens to the fifth lens respectively.

5. The video imaging lens according to claim 1, characterized in that: It satisfies the following conditional expressions, 50<vd1<70, 15<vd2<60, 50<vd3<75, 15<vd4<30, 50<vd5<70, where vd1 to vd5 are the Abbe numbers of the first lens to the fifth lens respectively.

6. The video imaging lens according to claim 1, characterized in that: It satisfies the following conditional expressions, 120<vd1+vd2+vd3<185, where vd1 to vd3 are the Abbe numbers of the first lens to the third lens respectively.

7. The video imaging lens according to claim 1, characterized in that: It satisfies the following conditional expressions, TTL / AAG≤6.0, where the AAG is the sum of four air gaps on the optical axis between the first lens and the fifth lens.

8. The video imaging lens according to claim 1, characterized in that: It satisfies the following conditional expressions, ALT<7.8, where ALT=CT +CT2+CT3+CT4+CT5, and CT1 to CT5 are the central thicknesses of the first lens to the fifth lens respectively.

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