CN116027524A - Video imaging lens - Google Patents

Abstract

The present invention relates to the field of imaging lenses, in particular to a video imaging lens, which 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; The first lens to the fifth lens each include an object side facing the object side and allowing the imaging light to pass through and an image side facing the image side and allowing the imaging light to pass through; the first lens has a negative refractive power; the 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 the following conditional formula is met: TTL≤14.3mm, TTL/F<6.66, the TTL is the total optical length of the lens, and the F is the clear aperture of the lens. When the spatial frequency of the video imaging lens reaches 112lp/mm, the MTF of the full viewing angle is greater than 0.32, which has a good imaging effect.

Description

A video imaging lens

technical field

The invention relates to the field of imaging lenses, in particular to a video imaging lens.

Background technique

With the development of wireless technology, the application of wireless transmission technology is more and more accepted by all walks of life. As a special method of use, wireless image transmission is gradually favored by the majority of users and widely used in work and life. Video conferencing also plays an important role in work. The existing video lens has a large outer diameter, and the imaging effect of the small-sized video lens is poor.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a video imaging lens, which can solve technical problems such as large outer diameter of the video lens and poor performance.

In order to solve the above technical problems, the present invention provides the following technical solutions:

A video imaging lens, characterized in that it 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; the first lens to the fifth lens The lenses each include an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through;

The first lens has negative refractive power, the object side is convex, and the image side is concave;

The second lens has positive refractive power, the object side is concave, and the image side is convex;

The third lens has positive refractive power, the object side is convex, and the image side is convex;

The fourth lens has negative refractive power, the object side is concave, and the image side is convex;

The fifth lens has positive refractive power, the object side is convex, and the image side is convex;

And meet the following conditions:

TTL≤14.3mm, TTL/F＜6.66,

The TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, and the F is the clear aperture of the lens.

Further, 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 a aperture.

Further, the following conditions are met, f1<|20|, f2<|70|, f3<|20|, f4<|20|, f5<|20|, the f1 to f5 are respectively the first lens to the second lens The focal length of the five lenses.

Further, the following conditions are met, 1<|f1/f|<8, 2<|f2/f|<20, 0<|f3/f|<8, 0<|f4/f|<8, 1< |f5/f|<10, 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.

Further, the following conditional formula is met, 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, the nd1 to nd5 are respectively the first lens to the second lens The refractive index of the five lenses.

Further, the following conditional formula is met, 50<vd1<70, 15<vd2<60, 50<vd3<75, 15<vd4<30, 50<vd5<70, and the vd1 to vd5 are respectively the first lens to the second lens Abbe's number of five lenses.

Further, the following conditional formula is met, 120<vd1+vd2+vd3<185, and the vd1 to vd3 are the Abbe coefficients of the first lens to the third lens respectively.

Further, the following conditional formula is met, TTL/AAG≤6.0, and the AAG is the sum of four air gaps on the optical axis between the first lens and the fifth lens.

Further, the following conditional formula is met, ALT<7.8, wherein ALT=CT1+CT2+CT3+CT4+CT5, where CT1 to CT5 are the center thicknesses of the first lens to the fifth lens respectively.

The beneficial effects of the present invention are:

This solution adopts a combination of one glass spherical lens and four plastic aspheric lenses, so that the maximum luminous flux F of the video imaging lens is 2.15. Less than 8mm, the overall volume is small, and the installation and use are more convenient. At the same time, when the spatial frequency of the video imaging lens reaches 112lp/mm, the MTF of the full viewing angle is greater than 0.32, which has a good imaging effect.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, 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 therefore do not It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is the optical path diagram of the video imaging lens according to Embodiment 1 of the present invention;

2 is an MTF curve diagram of the video imaging lens according to Embodiment 1 of the present invention;

3 is a defocus curve diagram of the video imaging lens according to Embodiment 1 of the present invention;

Fig. 4 is a relative illuminance curve diagram of the video imaging lens according to Embodiment 1 of the present invention;

FIG. 5 is a graph of longitudinal chromatic aberration of the video imaging lens according to Embodiment 1 of the present invention;

FIG. 6 is a field curvature and distortion diagram of the video imaging lens according to Embodiment 1 of the present invention;

FIG. 7 is an optical path diagram of the video imaging lens described in Embodiment 2 of the present invention;

8 is an MTF curve diagram of the video imaging lens described in Embodiment 2 of the present invention;

FIG. 9 is a defocus curve diagram of the video imaging lens described in Embodiment 2 of the present invention;

Fig. 10 is a graph of the relative illuminance of the video imaging lens according to Embodiment 2 of the present invention;

Fig. 11 is a graph of longitudinal chromatic aberration of the video imaging lens described in Embodiment 2 of the present invention;

FIG. 12 is a field curvature and distortion diagram of the video imaging lens described in Embodiment 2 of the present invention;

FIG. 13 is an optical path diagram of the video imaging lens described in Embodiment 3 of the present invention;

14 is an MTF curve diagram of the video imaging lens described in Embodiment 3 of the present invention;

FIG. 15 is a defocus curve diagram of the video imaging lens described in Embodiment 3 of the present invention;

Fig. 16 is a graph of the relative illuminance of the video imaging lens described in Embodiment 3 of the present invention;

Fig. 17 is a graph of longitudinal chromatic aberration of the video imaging lens described in Embodiment 3 of the present invention;

FIG. 18 is a diagram of field curvature and distortion of the video imaging lens according to Embodiment 3 of the present invention.

Description of main component symbols

1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Diaphragm; 7. Protective sheet; 8. Imaging surface.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to FIGS. 1-18 , the present invention provides a video imaging lens, which sequentially includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens along an optical axis from the object side to the image side. Lens 5; the first lens 1 to the fifth lens 5 each include an object side facing the object side and allowing the imaging light to pass through and an image side facing the image side and allowing the imaging light to pass; the first lens 1, the second lens 2, Both the fourth lens 4 and the fifth lens 5 are plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture 6 is arranged between the second lens 2 and the third lens 3 .

The first lens 1 has negative refractive power, the object side is convex, and the image side is concave;

The second lens 2 has positive refractive power, the object side is concave, and the image side is convex;

The third lens 3 has positive refractive power, the object side is convex, and the image side is convex;

The fourth lens 4 has negative refractive power, the object side is concave, and the image side is convex;

The fifth lens 5 has positive refractive power, the object side is convex, and the image side is convex;

Preferred, and meet the following conditions: TTL≤14.3mm, TTL/F<6.66, the TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, F is the clear aperture of the lens, and the overall structure Compact for miniaturization and higher practicability.

Preferably, the following conditions are met, f1<|20|, f2<|70|, f3<|20|, f4<|20|, f5<|20|, f1 to f5 are the first lens 1 to the fifth lens respectively 5 focal length. By controlling the focal lengths of different lenses, the focal power distribution is uniform, which is conducive to correcting temperature drift.

Preferably, the following conditions are met, 1<|f1/f|<8, 2<|f2/f|<20, 0<|f3/f|<8, 0<|f4/f|<8, 1< |f5/f|<10, 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.

Preferably, the following conditional formula is met, 50<vd1<70, 15<vd2<60, 50<vd3<75, 15<vd4<30, 50<vd5<70, vd1 to vd5 are respectively the first lens 1 to the fifth Abbe number of lens 5. Meet the following conditional formula, 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, nd1 to nd5 are respectively the first lens 1 to the fifth lens 5 refractive index. The refractive index and Abbe number of the first lens 1 and the second lens 2 are controlled, and materials with low refractive index and high Abbe number can be used to better correct aberrations such as off-axis lateral chromatic aberration and astigmatism.

Preferably, the following conditional formula is met, 120<vd1+vd2+vd3<185, and vd1 to vd3 are the Abbe coefficients of the first lens 1 to the third lens 3 respectively.

Preferably, the following conditional formula is met, TTL/AAG≤6.0, and AAG is the sum of four air gaps on the optical axis between the first lens 1 and the fifth lens 5 . By controlling the ratio of the optical length to the air space, the focal power between each lens can be better distributed, the field curvature of the lens can be controlled, and the imaging quality can be improved.

Preferably, the following conditional formula is met, ALT<7.8, wherein ALT=CT1+CT2+CT3+CT4+CT5, where CT1 to CT5 are the central thicknesses of the first lens 1 to the fifth lens 5 respectively. Controlling the lens thicknesses of the first lens 1 to the fifth lens 5 can better distribute the optical power of the lens and improve the imaging quality of the lens.

The video imaging lens of the present invention will be described in detail below with specific embodiments.

Embodiment one

Please refer to FIGS. 1-6 , the present invention provides a video imaging lens, which sequentially includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens along an optical axis from the object side to the image side. Lens 5; the first lens 1 to the fifth lens 5 each include an object side facing the object side and allowing the imaging light to pass through and an image side facing the image side and allowing the imaging light to pass; the first lens 1, the second lens 2, Both the fourth lens 4 and the fifth lens 5 are plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture 6 is arranged between the second lens 2 and the third lens 3 .

The first lens 1 has negative refractive power, the object side is convex, and the image side is concave;

The second lens 2 has positive refractive power, the object side is concave, and the image side is convex;

The third lens 3 has positive refractive power, the object side is convex, and the image side is convex;

The fourth lens 4 has negative refractive power, the object side is concave, and the image side is convex;

The fifth lens 5 has positive refractive power, the object side is convex, and the image side is convex;

The detailed optical data of this embodiment are shown in Table 1.

The detailed optical data of table 1 embodiment one

In this specific embodiment, the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspheric lenses, and the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens Please refer to the following table 2 for the detailed description of the aspheric surface of 5:

Table 2: Aspheric Coefficients

The focal length of the video imaging lens described in this embodiment is: TTL is 14.3mm, the outer diameter is less than 8mm, the volume is small, and the installation and use are more convenient; F is 2.15, which increases the amount of light entering the lens and improves imaging brightness; IMH is 6.388mm, IMH is the half-image height of the lens, which is half of the maximum image height of the lens.

In this specific embodiment, please refer to the accompanying drawing 1 for the optical path diagram of the video imaging lens. Please refer to the accompanying drawing 2 for the MTF curves of different focal lengths of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. It can be seen from the figure that the spatial frequency of the video imaging lens described in this embodiment reaches 112lp/mm When , the full-view MTF is greater than 0.52, which has a good imaging effect and meets the user's high-definition needs. Please refer to accompanying drawing 3 for the defocus curve diagram of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band. It can be seen that almost all the peaks of the curves are near the zero-offset vertical axis. At this time, the defocus characteristics of the video imaging lens are relatively good, and a larger effective focal depth range can be obtained. Please refer to the accompanying drawing 4 for the relative illuminance diagram of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band. It can be seen from the accompanying drawing 4 that, under the maximum field of view, RI>46%, the relative illuminance is high, and the picture High uniformity and good imaging effect. Please refer to the accompanying drawing 5 for the longitudinal chromatic aberration curve of the video imaging lens disclosed in this embodiment under the visible light band of 435nm-660nm. It can be seen from the accompanying drawing 5 that the maximum longitudinal chromatic aberration of the video imaging lens working in the visible light band is 0.05mm. The lateral chromatic aberration and longitudinal chromatic aberration of the optical lens are well corrected. Please refer to the accompanying drawing 6 for the field curvature distortion curve of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band. From the accompanying drawing 6, it can be seen that the optical distortion of the video imaging lens is less than 6%, the imaging quality is good, and the post-processing is reduced. Calibration difficulty.

Embodiment two

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 along an optical axis from the object side to the image side. Lens 5; the first lens 1 to the fifth lens 5 each include an object side facing the object side and allowing the imaging light to pass through and an image side facing the image side and allowing the imaging light to pass; the first lens 1, the second lens 2, Both the fourth lens 4 and the fifth lens 5 are plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture 6 is arranged between the second lens 2 and the third lens 3 .

The first lens 1 has negative refractive power, the object side is convex, and the image side is concave;

The second lens 2 has positive refractive power, the object side is concave, and the image side is convex;

The third lens 3 has positive refractive power, the object side is convex, and the image side is convex;

The fourth lens 4 has negative refractive power, the object side is concave, and the image side is convex;

The fifth lens 5 has positive refractive power, the object side is convex, and the image side is convex;

The detailed optical data of this embodiment is shown in Table 3.

The detailed optical data of table 3 embodiment two

In this specific embodiment, the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspheric lenses, and the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens Please refer to the following table 4 for a detailed description of the aspheric surface of 5:

Table 4: Aspheric Coefficients

The focal length of the video imaging lens described in this embodiment is: TTL is 14.3mm, the outer diameter is less than 8mm, the volume is small, and the installation and use are more convenient; F is 2.15, which increases the amount of light entering the lens and improves imaging brightness; IMH is 6.388mm, IMH is the half-image height of the lens, which is half of the maximum image height of the lens.

In this specific embodiment, please refer to FIG. 7 for the optical path diagram of the video imaging lens. Please refer to the accompanying drawing 8 for the MTF curves of different focal lengths of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. It can be seen from the figure that the spatial frequency of the video imaging lens described in this embodiment reaches 112lp/mm When , the full-view MTF is greater than 0.32, which has a good imaging effect and meets the user's high-definition needs. Please refer to accompanying drawing 9 for the defocus curve diagram of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band. It can be seen that the offset between the peak value of the curve and the zero-offset vertical axis is small, and the defocus characteristics of the video imaging lens are better at this time, and a larger effective focal depth range can be obtained. Please refer to the accompanying drawing 10 for the relative illuminance diagram of the video imaging lens disclosed in this embodiment under the band of visible light 435nm-660nm. It can be seen from the accompanying drawing 10 that under the maximum field of view, RI>48%, the relative illuminance is high, and the picture High uniformity and good imaging effect. For the longitudinal chromatic aberration curve of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band, please refer to the accompanying drawing 11. It can be seen from the accompanying drawing 11 that the maximum longitudinal chromatic aberration of the video imaging lens working in the visible light band is 0.02mm. The lateral chromatic aberration and longitudinal chromatic aberration of the optical lens are well corrected. For the field curvature distortion curve of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band, please refer to the accompanying drawing 12. From the accompanying drawing 12, it can be seen that the optical distortion of the video imaging lens is less than 6%, the imaging quality is good, and the post-processing is reduced. Calibration difficulty.

Embodiment Three

13-18, the present invention provides a video imaging lens, which sequentially includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens along an optical axis from the object side to the image side. Lens 5; the first lens 1 to the fifth lens 5 each include an object side facing the object side and allowing the imaging light to pass through and an image side facing the image side and allowing the imaging light to pass; the first lens 1, the second lens 2, Both the fourth lens 4 and the fifth lens 5 are plastic aspherical lenses, the third lens 3 is a glass spherical lens, and an aperture 6 is arranged between the second lens 2 and the third lens 3 .

The first lens 1 has negative refractive power, the object side is convex, and the image side is concave;

The second lens 2 has positive refractive power, the object side is concave, and the image side is convex;

The third lens 3 has positive refractive power, the object side is convex, and the image side is convex;

The fourth lens 4 has negative refractive power, the object side is concave, and the image side is convex;

The fifth lens 5 has positive refractive power, the object side is convex, and the image side is convex;

The detailed optical data of this embodiment is shown in Table 5.

The detailed optical data of table 5 embodiment three

In this specific embodiment, the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens 5 are all plastic aspheric lenses, and the first lens 1, the second lens 2, the fourth lens 4 and the fifth lens Please refer to the following table 6 for a detailed description of the aspheric surface of 5:

Table 6: Aspherical Coefficients

The focal length of the video imaging lens described in this embodiment is: TTL is 14.3mm, the outer diameter is less than 8mm, the volume is small, and the installation and use are more convenient; F is 2.15, which increases the amount of light entering the lens and improves imaging brightness; IMH is 6.388mm, IMH is the half-image height of the lens, which is half of the maximum image height of the lens.

In this specific embodiment, please refer to FIG. 13 for the optical path diagram of the video imaging lens. Please refer to the accompanying drawing 14 for the MTF curves of different focal lengths of the video imaging lens disclosed in this embodiment in the visible light 435nm-660nm band. It can be seen from the figure that the spatial frequency of the video imaging lens described in this embodiment reaches 112lp/mm When , the full-view MTF is greater than 0.38, which has a good imaging effect and meets the user's high-definition needs. Please refer to accompanying drawing 15 for the defocus curve diagram of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band. It can be seen that almost all the peaks of the curves are near the zero-offset vertical axis. At this time, the defocus characteristics of the video imaging lens are relatively good, and a larger effective focal depth range can be obtained. Please refer to the accompanying drawing 16 for the relative illuminance diagram of the video imaging lens disclosed in this embodiment under the band of visible light 435nm-660nm. It can be seen from the accompanying drawing 16 that under the maximum field of view, RI>42%, the relative illuminance is high, and the picture High uniformity and good imaging effect. Please refer to the accompanying drawing 17 for the longitudinal chromatic aberration curve of the video imaging lens disclosed in this embodiment under the visible light band of 435nm-660nm. It can be seen from the accompanying drawing 17 that the maximum longitudinal chromatic aberration of the video imaging lens working in the visible light band is 0.03mm. The lateral chromatic aberration and longitudinal chromatic aberration of the optical lens are well corrected. Please refer to the accompanying drawing 18 for the field curvature distortion curve of the video imaging lens disclosed in this embodiment under the visible light 435nm-660nm band. From the accompanying drawing 18, it can be seen that the optical distortion of the video imaging lens is less than 10%, the imaging quality is good, and the post-processing is reduced. Calibration difficulty.

Table 7 is the numerical value of relevant important parameter of three embodiments of the present invention:

Table 7: Relevant important parameters of each embodiment

Conditional 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

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and those described in the above-mentioned embodiments and description are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. A video imaging lens, characterized in that it comprises 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; the first lens to the image side The fifth lenses each include an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through; The first lens has negative refractive power, the object side is convex, and the image side is concave; The second lens has positive refractive power, the object side is concave, and the image side is convex; The third lens has positive refractive power, the object side is convex, and the image side is convex; The fourth lens has negative refractive power, the object side is concave, and the image side is convex; The fifth lens has positive refractive power, the object side is convex, and the image side is convex; And meet the following conditions: TTL≤14.3mm, TTL/F＜6.66, The TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, and the F is the clear aperture of the lens. 2. The video imaging lens according to claim 1, wherein the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses, and the third lens is a glass spherical lens , a diaphragm is arranged between the second lens and the third lens. 3. The video imaging lens according to claim 1, characterized in that: it meets the following conditional formula, f1<|20|, f2<|70|, f3<|20|, f4<|20|, f5<|20 |, the f1 to f5 are respectively the focal lengths of the first lens to the fifth lens. 4. The video imaging lens according to claim 1, characterized in that: it meets the following conditional formula, 1<|f1/f|<8, 2<|f2/f|<20, 0<|f3/f|< 8, 0<|f4/f|<8, 1<|f5/f|<10, the f1 to f5 are respectively the focal lengths of the first lens to the fifth lens, and f is the focal length of the lens. 5. The video imaging lens according to claim 1, characterized in that: it meets the following conditional formula, 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, the nd1 to nd5 are respectively the refractive indices of the first lens to the fifth lens. 6. The video imaging lens according to claim 1, characterized in that: the following conditions are met: 50<vd1<70, 15<vd2<60, 50<vd3<75, 15<vd4<30, 50<vd5< 70. The vd1 to vd5 are Abbe coefficients of the first lens to the fifth lens, respectively. 7. The video imaging lens according to claim 1, characterized in that: the following conditional formula is met, 120<vd1+vd2+vd3<185, and the vd1 to vd3 are the Abbe coefficients of the first lens to the third lens respectively . 8. The video imaging lens according to claim 1, characterized in that: it meets the following conditional formula, TTL/AAG≤6.0, and the AAG is the sum of four air gaps on the optical axis between the first lens and the fifth lens . 9. The video imaging lens according to claim 1, characterized in that: the following conditional formula is met, ALT<7.8, wherein ALT=CT1+CT2+CT3+CT4+CT5, the CT1 to CT5 are respectively the first lens to The center thickness of the fifth lens.

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