CN212302050U - Wide-angle imaging lens for video transmission - Google Patents
Wide-angle imaging lens for video transmission Download PDFInfo
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- CN212302050U CN212302050U CN202021911701.8U CN202021911701U CN212302050U CN 212302050 U CN212302050 U CN 212302050U CN 202021911701 U CN202021911701 U CN 202021911701U CN 212302050 U CN212302050 U CN 212302050U
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Abstract
The utility model discloses a wide angle imaging lens for video transmission includes first lens to ninth lens in proper order along an optical axis from the thing side to picture side, first lens to ninth lens include an object side that faces the thing side and make imaging light pass through and an image side that faces picture side and make imaging light pass through separately. The utility model adopts nine lenses along the direction from the object side to the image side, and makes the imaging field angle of the lens large and the application range large by correspondingly designing each lens; the resolution of the lens reaches 4K, the imaging quality is ensured, the light transmission F/2.3 is about, the image edge illumination is uniform, the imaging signal-to-noise ratio is ultrahigh, and the development of later-stage image optimization algorithm is facilitated; the blue-violet side chromatic aberration is corrected, and the phenomena of blue-violet side and the like can not occur during imaging; the lens is low in manufacturing cost, easy to use in large-scale mass production, capable of improving product competitiveness, small in temperature drift, capable of offsetting the influence of temperature disturbance on imaging quality, and clear in picture without defocusing.
Description
Technical Field
The utility model relates to a camera lens technical field, concretely relates to wide angle imaging lens for video-information transmission.
Background
With the rapid development of global economy, the demand of people on video transmission is increasing day by day, and the video transmission is widely applied to various departments such as government, military, medical treatment, teaching and the like, thereby providing reliable guarantee for the rapid development of global economy.
However, the imaging lens currently applied to the field of video transmission has at least the following defects:
1. the horizontal FOV of the existing video transmission lens is more than 80-100 degrees, and when the existing video transmission lens is used in a large field, the imaging field angle is seriously insufficient.
2. The existing video transmission lens has the defects of about two million pixels, high image noise point, poor imaging quality and difficult post-algorithm processing.
3. The existing video transmission lens generally has blue-violet side chromatic aberration due to the wide-angle low-distortion design, which affects the image quality.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wide angle imaging lens for video transmission, blue purple limit colour difference can not appear when its formation of image angle of vision is big, image quality is good, formation of image.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a wide-angle imaging lens for video transmission sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a planar object-side surface and a concave image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the fourth lens is mutually glued with the object side surface of the fifth lens, the image side surface of the sixth lens is mutually glued with the object side surface of the seventh lens, the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens, the third lens, the eighth lens and the ninth lens are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fifth lens and the sixth lens.
Further, the focal length range of the first to ninth lenses satisfies the following condition:
-6< f1< -14, -6< f2< -4, -25< f3<23, 8< f4< -10, 4< f5<6, -11< f6< -9, -47< f7< -45, 6< f8<8, 12< f9<14, wherein f1, f2, f3, f4, f5, f6, f7, f8, f9 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, respectively.
Further, the ratio of the focal length of the first, fourth, fifth, sixth and seventh lenses to the focal length of the lens satisfies the following relationship:
-8< (f1/f) < -6, 3< (f4/f) <5, 2< (f5/f) <3, -6< (f6/f) < -4, -24< (f7/f) < -22, wherein f is the focal length of the lens, and f1, f4, f5, f6, f7 are the focal length values of the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, respectively.
A wide-angle imaging lens for video transmission sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a planar object-side surface and a concave image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the fourth lens is mutually glued with the object side surface of the fifth lens, the image side surface of the sixth lens is mutually glued with the object side surface of the seventh lens, the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens, the third lens, the eighth lens and the ninth lens are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fifth lens and the sixth lens.
A wide-angle imaging lens for video transmission sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the sixth lens and the object side surface of the seventh lens are mutually glued, the third, fourth, fifth, sixth and seventh lenses are glass spherical lenses, the first, second, eighth and ninth lenses are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fourth lens and the fifth lens.
A wide-angle imaging lens for video transmission sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the fifth lens and the object side surface of the sixth lens are mutually glued, the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens, the third lens, the eighth lens and the ninth lens are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fourth lens and the fifth lens.
The focusing mechanism is arranged on the base and is in transmission connection with the lens frame, and the focusing mechanism is used for adjusting the distance between the lens frame and the base so as to perform focusing.
Further, the focusing mechanism includes adjustable ring, gear train and motor, the top of base upwards extends and forms a connecting cylinder, be equipped with on the connecting cylinder the light trap, the adjustable ring includes interior link, external ring and outer ring gear, interior link and picture frame outer wall looks spiro union, external ring and connecting cylinder inner wall looks spiro union, just the screw thread pitch of interior link is greater than the screw thread pitch of external ring, outer ring gear is connected with the gear train transmission, the motor install in on the base, the output of motor passes through the gear train with the outer ring gear cooperation of adjustable ring with output torque.
Furthermore, the focusing mechanism further comprises a permanent magnet and a Hall sensor, the permanent magnet is fixedly arranged on the lens frame and moves up and down along with the lens frame, and the Hall sensor is arranged on the base and used for sensing the position of the permanent magnet so as to position the lens barrel.
After the technical scheme is adopted, compared with the background art, the utility model, have following advantage:
1. the utility model adopts nine lenses along the direction from the object side to the image side, and makes the horizontal FOV of the lens between 110 degrees and 120 degrees through correspondingly designing each lens, thereby having large imaging field angle and wide application range; the resolution ratio of the lens reaches 4K, the imaging quality is guaranteed, the light transmission F/2.3 is about, the image edge illumination is uniform, the imaging signal-to-noise ratio is ultrahigh, and the development of later-stage image optimization algorithms is facilitated.
2. The utility model discloses a multi-disc aspheric surface design, under the prerequisite of having guaranteed the low distortion formation of image of wide angle, blue purple limit colour difference has been corrected, phenomenons such as blue purple limit can not appear during the formation of image, and simultaneously, adopt the glass to mould mixed design, not only the cost is all shared to the plastics aspheric surface, make the low in manufacturing cost who takes the camera lens, easily extensive volume production is used, promote product competitiveness, and the temperature drift volume is little, can offset the influence of temperature disturbance to imaging quality, the clear not defocus of picture, satisfy the operation requirement under most video-communication meeting and other more adverse circumstances.
3. The utility model discloses a motor output torque drives gear train, drives the adjustable ring by the gear train, rotates through the adjustable ring and drives picture frame screw thread and close the degree of depth change soon, realizes optics automatic focusing process, and the noise is little, and the picture shake is little, and is clear not the defocus, simultaneously, through the position of hall sensor detection picture frame, prevents to lead to the precision decline of focus because of gear drive step-out accumulation.
Drawings
Fig. 1 is one of the schematic perspective views of the present invention;
fig. 2 is a second perspective view of the present invention;
fig. 3 is a cross-sectional view of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
fig. 5 is a bottom view of the present invention;
fig. 6 is a light path diagram of an imaging lens according to a first embodiment of the present invention;
fig. 7 is a graph of MTF curve of an imaging lens in a first embodiment of the present invention under visible light;
fig. 8 is a defocus graph of the imaging lens in the first embodiment of the present invention under visible light;
fig. 9 is a longitudinal aberration diagram of an imaging lens in a first embodiment of the present invention under visible light;
fig. 10 is a view illustrating curvature of field and distortion of an imaging lens under visible light according to a first embodiment of the present invention;
fig. 11 is a light path diagram of an imaging lens according to a second embodiment of the present invention;
fig. 12 is a graph of MTF curve of the imaging lens in the second embodiment of the present invention under visible light;
fig. 13 is a defocus graph of the imaging lens in the second embodiment of the present invention under visible light;
fig. 14 is a longitudinal aberration diagram of the imaging lens in the second embodiment of the present invention under visible light;
fig. 15 is a view of curvature of field and distortion of the imaging lens under visible light according to the second embodiment of the present invention;
fig. 16 is an optical path diagram of an imaging lens according to a third embodiment of the present invention;
fig. 17 is a MTF graph of the imaging lens in the third embodiment of the present invention under visible light;
fig. 18 is a defocus graph of the imaging lens in the third embodiment of the present invention under visible light;
fig. 19 is a longitudinal aberration diagram of the imaging lens in the third embodiment of the present invention under visible light;
fig. 20 is a view of curvature of field and distortion of the imaging lens under visible light in the third embodiment of the present invention;
fig. 21 is a light path diagram of an imaging lens in the fourth embodiment of the present invention;
fig. 22 is a graph of MTF curve of the imaging lens in the fourth embodiment of the present invention under visible light;
fig. 23 is a defocus graph of the imaging lens in the fourth embodiment of the present invention under visible light;
fig. 24 is a longitudinal aberration diagram of the imaging lens in the fourth embodiment of the present invention under visible light;
fig. 25 is a view illustrating curvature of field and distortion of the imaging lens under visible light according to the fourth embodiment of the present invention;
fig. 26 is an optical path diagram of an imaging lens in the fifth embodiment of the present invention;
fig. 27 is a MTF graph of the imaging lens in the fifth embodiment of the present invention under visible light;
fig. 28 is a defocus graph of the imaging lens in the fifth embodiment of the present invention under visible light;
fig. 29 is a longitudinal aberration diagram of the imaging lens in the fifth embodiment of the present invention under visible light;
fig. 30 is a view illustrating curvature of field and distortion of the imaging lens under visible light according to the fifth embodiment of the present invention.
Description of reference numerals:
a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, an eighth lens 18, a ninth lens 19, and an aperture 110;
the base 2, the light hole 21 and the connecting cylinder 22;
a frame 3;
a lens barrel 4;
the focusing mechanism 5, the adjusting ring 51, the inner ring 511, the outer ring 512, the outer gear ring 513, the gear set 52, the motor 53 and the Hall sensor 54.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
With reference to fig. 1 to 5, the present invention discloses a wide-angle imaging lens for video transmission, which sequentially includes a first lens element 11 to a ninth lens element 19 along an optical axis from an object side to an image side, wherein the first lens element 11 to the ninth lens element 19 respectively include an object side surface facing the object side and allowing the imaging light to pass through and an image side surface facing the image side and allowing the imaging light to pass through.
The utility model provides a wide angle imaging lens for video transmission, still includes base 2, picture frame 3, lens cone 4 and focusing mechanism 5, set up a light trap 21 in base 2, light trap 21 is used for holding picture frame 3, lens cone 4 is installed in picture frame 3, first lens 11 to ninth lens 19 are installed in lens cone 4, focusing mechanism 5 sets up on base 2 to be connected with the transmission of picture frame 3, adjust the distance of picture frame 3 relative base 2 in order to focus through focusing mechanism 5.
The focusing mechanism 5 comprises an adjusting ring 51, a gear set 52 and a motor 53, the top of the base 2 extends upwards to form a connecting cylinder 22, a light hole 21 is formed in the connecting cylinder 22, the adjusting ring 51 comprises an inner ring 511, an outer ring 512 and an outer gear ring 513, the inner ring 511 is in threaded connection with the outer wall of the lens frame 3, the outer ring 512 is in threaded connection with the inner wall of the connecting cylinder 22, the thread pitch of the inner ring 511 is larger than that of the outer ring 512, the outer gear ring 513 is in transmission connection with the gear set 52, the motor 53 is installed on the base 2, and the output end of the motor 53 is matched with the outer gear ring 513 of the adjusting ring 51 through the gear set 52 to. After the motor 53 outputs torque to drive the gear set 52, the gear set 52 drives the adjusting ring 51, and the adjusting ring 51 rotates to drive the thread screwing depth of the lens frame 3 to change, so that the optical automatic focusing process is realized.
The focusing mechanism 5 further includes a permanent magnet (not shown in the figure) fixed on the frame 3 and moving up and down together with the frame, and a hall sensor 54 provided on the base 2 for sensing the position of the permanent magnet to position the lens barrel 4. When the lens frame 3 moves, the lens frame 3 and the hall sensor 54 move (displace) relatively, and at this time, the hall sensor 54 generates different signals, that is, the different signals are used to detect the position of the lens. Because there is the multiple clearance step-out in gear drive, the step-out accumulation can appear after long-time motion, detects the position of picture frame 3 through the position of hall sensor 54 response permanent magnet to the position of camera lens can be rectified, prevents to lead to the precision decline of focusing because of gear drive step-out accumulation.
The wide-angle imaging lens of the present invention will be described in detail with reference to specific embodiments.
Example one
In conjunction with fig. 6 to 10, the present embodiment discloses a wide-angle imaging lens for video transmission, which includes, in order from an object side to an image side along an optical axis, a first lens element 11 to a ninth lens element 19, where the first lens element 11 to the ninth lens element 19 respectively include an object side surface facing the object side and allowing the imaging light to pass therethrough and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element 11 has a negative refractive index, and has a convex object-side surface and a concave image-side surface;
the second lens element 12 with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element 13 with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element 14 with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element 15 with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element 16 with negative refractive index has a planar object-side surface and a concave image-side surface;
the seventh lens element 17 with positive refractive index has a convex object-side surface and a convex image-side surface;
the eighth lens element 18 with positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element 19 with positive refractive power has a concave object-side surface and a convex image-side surface;
the image-side surface of the fourth lens element 14 and the object-side surface of the fifth lens element 15 are cemented with each other, the image-side surface of the sixth lens element 16 and the object-side surface of the seventh lens element 17 are cemented with each other, the first, fourth, fifth, sixth and seventh lens elements are glass spherical lens elements, the second, third, eighth and ninth lens elements are plastic high-order even-order aspheric lens elements, and a diaphragm 110 is disposed between the fifth lens element 15 and the sixth lens element 16, but in other embodiments, the diaphragm 110 may be disposed at other suitable positions.
The focal length range of the first lens 11 to the ninth lens 19 satisfies the following condition:
-6< f1< -14, -6< f2< -4, -25< f3<23, 8< f4< -10, 4< f5<6, -11< f6< -9, -47< f7< -45, 6< f8<8, 12< f9<14, wherein f1, f2, f3, f4, f5, f6, f7, f8, f9 are the focal length values of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, the eighth lens 18, the ninth lens 19, respectively.
The ratio of the focal length of the first, fourth, fifth, sixth and seventh lenses to the focal length of the lens satisfies the following relationship:
-8< (f1/f) < -6, 3< (f4/f) <5, 2< (f5/f) <3, -6< (f6/f) < -4, -24< (f7/f) < -22, wherein f is the focal length of the lens, and f1, f4, f5, f6, f7 are the focal length values of the first lens 11, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17, respectively.
Detailed optical data of this embodiment are shown in table 1.
Table 1 detailed optical data of example one
Surface of | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | |
||
0 | Shot object | Infinite size | |||||||
1 | First lens | 15.302 | 11.832 | 0.960 | H-LAF50B | 1.772501 | 49.6135 | -15.74 | |
2 | 10.792 | 5.795 | 2.370 | ||||||
3 | Second lens | 10.502 | 23.553 | 0.925 | ZEONEX_K26R | 1.535037 | 55.7107 | -5.47 | |
4 | 7.346 | 2.574 | 1.608 | ||||||
5 | Third lens | 7.120 | 9.253 | 0.780 | EP6000 | 1.640 | 23.529 | -24.97 | |
6 | 5.806 | 5.681 | 1.618 | ||||||
7 | Fourth lens | 5.769 | 28.057 | 0.600 | H-ZPK1A | 1.618 | 63.406 | -9.16 | |
8 | Fifth lens element | 5.551299 | 4.681 | 3.810 | H-ZLAF92 | 2.003 | 28.317 | 3.63 | |
9 | 4.504 | -9.977 | 1.324 | ||||||
10 | 1.909 | Infinite size | 0.013 | ||||||
11 | Sixth lens element | 1.923 | Infinite size | 1.910 | FDS18 | 1.945945 | 17.9843 | -3.88 | |
12 | Seventh lens element | 3.053 | 3.707 | 1.640 | FCD515 | 1.592824 | 68.6244 | 4.59 | |
13 | 4.119 | -8.640 | 0.070 | ||||||
14 | Eighth lens element | 5.545 | 7.557 | 1.555 | ZEONEX_K26R | 1.535037 | 55.7107 | 7.61 | |
15 | 5.645 | -8.259 | 0.127 | ||||||
16 | Ninth lens | 5.673 | -24.763 | 1.290 | ZEONEX_K26R | 1.535037 | 55.7107 | 13.05 | |
17 | 5.905 | -5.558 | 0.100 | ||||||
18 | Cover glass | 6.010 | Infinite size | 0.800 | H-K9L | 1.516797 | 64.2124 | ||
19 | 6.070 | Infinite size | 2.700 | ||||||
20 | Image plane | 6.409 | Infinite size |
Fig. 6 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 7, it can be seen that when the spatial frequency of the lens reaches 160lp/mm, the full-field transfer function image is still greater than 35%, and the imaging quality is excellent. Referring to fig. 8, the defocus amount of the visible light in fig. 8 is less than 9 μm, and the confocal optical system has a confocal function and can be used for both day and night. Referring to fig. 9, it can be seen that the longitudinal aberration is less than ± 0.07mm, the color reduction is good, and the blue-violet phenomenon is not obvious. Referring to fig. 10, it can be seen that the distortion is less than-5%, the image is less in shape, the image is more accurate to restore the image, and the imaging quality is high.
Example two
As shown in fig. 11 to 15, in this embodiment, the surface convexoconcave and the refractive index of each lens element are substantially the same as those of the first embodiment, and only the surface convexoconcave of the eighth lens element is not uniform.
The detailed optical data of this embodiment are shown in table 2.
Table 2 detailed optical data of example one
Surface of | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | |
||
0 | Shot object | Infinite size | |||||||
1 | First lens | 8.722 | 11.889 | 1.148 | H-LAF50B | 1.772501 | 49.6135 | -17.34 | |
2 | 5.545 | 6.043 | 2.274 | ||||||
3 | Second lens | 5.134 | 25.000 | 1.371 | K26R | 1.535011 | 55.6341 | -5.59 | |
4 | 5.024 | 2.628 | 2.170 | ||||||
5 | Third lens | 3.694 | 14.013 | 0.900 | EP6000 | 1.640 | 23.529 | -18.20 | |
6 | 7.000 | 6.225 | 1.199 | -9.11 | |||||
7 | Fourth lens | 7.000 | 41.125 | 0.600 | H-ZPK5 | 1.593 | 68.525 | ||
8 | Fifth lens element | 4.3 | 4.760 | 3.051 | TAFD65 | 2.051 | 26.942 | ||
9 | 4.931 | -10.430 | 1.425 | 3.45 | |||||
10 | 5.200 | Infinite size | 0.013 | -3.66 | |||||
11 | Sixth lens element | 5.387 | Infinite size | 1.560 | H-ZF88 | 1.945958 | 17.9439 | ||
12 | Seventh lens element | 5.963 | 3.494 | 1.578 | H-ZPK5 | 1.592807 | 68.5250 | 4.39 | |
13 | 6.052 | -8.591 | 0.100 | ||||||
14 | Eighth lens element | 6.621 | 9.006 | 1.448 | K26R | 1.535011 | 55.6341 | 7.70 | |
15 | 7.189 | -7.209 | 0.162 | ||||||
16 | Ninth lens | 7.758 | -24.886 | 1.599 | K26R | 1.535011 | 55.6341 | 11.51 | |
17 | 8.327 | -5.060 | 0.100 | ||||||
18 | Cover glass | 8.895 | Infinite size | 0.800 | H-K9L | 1.516797 | 64.2124 | ||
19 | 9.464 | Infinite size | 2.703 | ||||||
20 | Image plane | 10.033 | Infinite size |
Fig. 11 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 12, it can be seen that when the spatial frequency of the lens reaches 160lp/mm, the full-field transfer function image is still greater than 30%, and the imaging quality is excellent. Referring to fig. 13, the defocus amount of the visible light in fig. 13 is less than 9 μm, and the confocal optical system has a confocal function and can be used for both day and night. Referring to fig. 14, it can be seen that the longitudinal aberration is less than ± 0.05mm, the color reduction is good, and the blue-violet phenomenon is not obvious. Referring to fig. 15, it can be seen that the distortion is less than-5%, the image is less in shape, the image is more accurate to restore the image, and the imaging quality is high.
EXAMPLE III
As shown in fig. 16 to 20, the optical parameters of the lens elements of the present embodiment and the first embodiment are different, such as surface roughness, refractive index, surface curvature radius, and lens thickness.
The first lens element 11 has a negative refractive index, and has a convex object-side surface and a concave image-side surface;
the second lens element 12 with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element 13 with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element 14 with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element 15 with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element 16 with negative refractive index has a planar object-side surface and a concave image-side surface;
the seventh lens element 17 with positive refractive index has a convex object-side surface and a convex image-side surface;
the eighth lens element 18 with positive refractive index has a convex object-side surface and a concave image-side surface;
the ninth lens element 19 with positive refractive power has a concave object-side surface and a convex image-side surface;
the image-side surface of the fourth lens element 14 and the object-side surface of the fifth lens element 15 are cemented with each other, the image-side surface of the sixth lens element 16 and the object-side surface of the seventh lens element 17 are cemented with each other, the first, fourth, fifth, sixth and seventh lens elements are glass spherical lens elements, the second, third, eighth and ninth lens elements are plastic high-order even-order aspheric lens elements, and a diaphragm 110 is disposed between the fifth lens element 15 and the sixth lens element 16, but in other embodiments, the diaphragm 110 may be disposed at other suitable positions.
The detailed optical data of this embodiment are shown in table 3.
Table 3 detailed optical data of example one
Surface of | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | |
||
0 | Shot object | Infinite size | |||||||
1 | First lens | 16.057 | 12.680 | 1.000 | H-LAF50B | 1.772501 | 49.6135 | -15.87 | |
2 | 11.248 | 6.029 | 2.371 | ||||||
3 | Second lens | 11.015 | 25.000 | 1.300 | K26R | 1.535011 | 55.6341 | -5.98 | |
4 | 7.532 | 2.794 | 1.783 | ||||||
5 | Third lens | 7.134 | 9.958 | 0.880 | EP6000 | 1.640 | 23.529 | -26.60 | |
6 | 5.742 | 6.081 | 1.565 | ||||||
7 | Fourth lens | 5.698 | 88.761 | 0.600 | H-LAK50A | 1.652 | 58.416 | -7.37 | |
8 | Fifth lens element | 5.483099 | 4.557 | 2.813 | H-ZLAF92 | 2.003 | 28.317 | 3.46 | |
9 | 4.800 | -10.339 | 1.605 | ||||||
10 | 1.888 | Infinite size | 0.013 | ||||||
11 | Sixth lens element | 1.901 | Infinite size | 1.818 | H-ZF88 | 1.945958 | 17.9439 | -4.20 | |
12 | Seventh lens element | 3.940 | 4.017 | 1.548 | H-ZPK5 | 1.592807 | 68.5250 | 4.37 | |
13 | 3.940 | -6.285 | 0.100 | ||||||
14 | Eighth lens element | 4.782 | 9.703 | 0.824 | K26R | 1.535011 | 55.6341 | -305.84 | |
15 | 5.165 | 8.889 | 0.324 | ||||||
16 | Ninth lens | 6.019 | 5.045 | 2.056 | K26R | 1.535011 | 55.6341 | 5.50 | |
17 | 6.051 | -6.095 | 0.100 | ||||||
18 | Cover glass | 6.117 | Infinite size | 0.800 | H-K9L | 1.516797 | 64.2124 | ||
19 | 6.172 | Infinite size | 2.704 | ||||||
20 | Image plane | 6.453 | Infinite size |
Fig. 16 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 17, it can be seen that when the spatial frequency of the lens reaches 160lp/mm, the full-field transfer function image is still greater than 40%, and the imaging quality is excellent. Referring to fig. 18, the defocus amount of the visible light in fig. 18 is less than 9 μm, and the confocal optical system has a confocal function and can be used for both day and night. Referring to fig. 19, it can be seen that the longitudinal aberration is less than ± 0.07mm, the color reduction is good, and the blue-violet phenomenon is not obvious. Referring to fig. 20, it can be seen that the distortion is less than-5%, the image is less in shape, the image is more accurate to restore the image, and the imaging quality is high.
Example four
As shown in fig. 21 to 25, the optical parameters of the lens elements of this embodiment and the first embodiment are different, such as surface roughness, refractive index, surface curvature radius, and lens thickness.
The first lens element 11 has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the second lens element 12 has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element 13 with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element 14 with positive refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element 15 with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element 16 with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element 17 with negative refractive index has a concave object-side surface and a convex image-side surface;
the eighth lens element 18 with positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element 19 with positive refractive power has a concave object-side surface and a convex image-side surface;
the image-side surface of the sixth lens element 16 and the object-side surface of the seventh lens element 17 are cemented with each other, the third, fourth, fifth, sixth and seventh lens elements are glass spherical lens elements, the first, second, eighth and ninth lens elements are plastic high-order even-order aspheric lens elements, and a stop 110 is disposed between the fourth lens element 14 and the fifth lens element 15, but the stop 110 may be disposed at other suitable positions in other embodiments.
The detailed optical data of this embodiment are shown in table 4.
Table 4 detailed optical data of example one
Surface of | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | |
||
0 | Shot object | Infinite size | |||||||
1 | First lens | 16.094 | -33.389 | 1.674 | EP6000 | 1.639730 | 23.5289 | -6.21 | |
2 | 8.304 | 4.635 | 2.680 | ||||||
3 | Second lens | 7.896 | -18.126 | 0.653 | EP6000 | 1.639730 | 23.5289 | -7.38 | |
4 | 5.997 | 6.528 | 2.469 | ||||||
5 | Third lens | 5.864 | -8.527 | 2.964 | H-ZF3 | 1.717 | 29.510 | 17.80 | |
6 | 6.110 | -5.872 | 0.174 | ||||||
7 | Fourth lens | 4.800 | 5.593 | 1.309 | H-ZF88 | 1.946 | 17.944 | 10.60 | |
8 | 3.987566 | 11.069 | 1.859 | ||||||
9 | 1.753 | Infinite size | 0.267 | ||||||
10 | Fifth lens element | 2.043 | 34.760 | 1.612 | H-FK61 | 1.496998 | 81.5947 | 9.62 | |
11 | 2.919 | -5.475 | 0.099 | ||||||
12 | Sixth lens element | 3.078 | -18.691 | 1.761 | H-LAK53B | 1.754998 | 52.3374 | 3.08 | |
13 | Seventh lens element | 3.524 | -2.160 | 0.536 | H-ZF88 | 1.945958 | 17.9439 | -2.51 | |
14 | 4.399 | -24.655 | 0.077 | ||||||
15 | Eighth lens element | 5.122 | 11.515 | 1.214 | ZEONEX_F | 1.534611 | 56.0721 | 7.30 | |
16 | 5.222 | -5.712 | 0.093 | ||||||
17 | Ninth lens | 5.983 | -14.287 | 1.636 | ZEONEX_F | 1.534611 | 56.0721 | 13.19 | |
18 | 6.042 | -4.920 | 0.093 | ||||||
19 | Cover glass | 6.112 | Infinite size | 0.800 | H-K9L | 1.516797 | 64.2124 | ||
20 | 6.175 | Infinite size | 1.754 | ||||||
21 | Image plane | 6.446 | Infinite size |
Fig. 21 is a diagram of an optical path of the optical imaging lens in this embodiment. Referring to fig. 22, it can be seen that when the spatial frequency of the lens reaches 1601p/mm, the full-field transfer function image is still greater than 35%, and the imaging quality is excellent. Referring to fig. 23, the defocus amount of the visible light in fig. 23 is less than 9 μm, and the confocal optical system has a confocal function and can be used for both day and night. Referring to fig. 24, it can be seen that the longitudinal aberration is less than ± 0.07mm, the color reduction is good, and the blue-violet phenomenon is not obvious. Referring to fig. 25, it can be seen that the distortion is less than-5%, the image is less in shape, the image is more accurate to restore the image, and the imaging quality is high.
EXAMPLE five
As shown in fig. 26 to 30, the optical parameters of the lens elements of the present embodiment and the first embodiment are different, such as surface roughness, refractive index, surface curvature radius, and lens thickness.
The first lens element 11 has a negative refractive index, and has a convex object-side surface and a concave image-side surface;
the second lens element 12 with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element 13 with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element 14 with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element 15 with positive refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element 16 with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element 17 with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element 18 with positive refractive index has a convex object-side surface and a concave image-side surface;
the ninth lens element 19 with positive refractive power has a concave object-side surface and a convex image-side surface;
the image-side surface of the fifth lens element 15 and the object-side surface of the sixth lens element 16 are cemented with each other, the first, fourth, fifth, sixth and seventh lens elements are glass spherical lens elements, the second, third, eighth and ninth lens elements are plastic high-order even-order aspheric lens elements, and a diaphragm 110 is disposed between the fourth lens element 14 and the fifth lens element 15, but the diaphragm 110 may be disposed at other suitable positions in other embodiments.
The detailed optical data of this embodiment is shown in table 5.
Table 5 detailed optical data of example one
Surface of | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | |
||
0 | Shot object | Infinite size | |||||||
1 | First lens | 12.723 | 10.321 | 1.000 | H-ZLAF68N | 1.883001 | 39.2253 | -10.21 | |
2 | 8.629 | 4.623 | 2.331 | ||||||
3 | Second lens | 8.496 | 25.000 | 1.380 | APL5015AL | 1.544514 | 56.0033 | -3.76 | |
4 | 5.869 | 1.872 | 2.491 | ||||||
5 | Third lens | 7.000 | 5.984 | 3.297 | H-ZF52 | 1.847 | 23.787 | 4.71 | |
6 | 7.000 | -9.507 | 0.160 | ||||||
7 | Fourth lens | 4.302 | -6.437 | 2.780 | EP6000 | 1.640 | 23.529 | -42.09 | |
8 | 2.390 | -9.839 | 0.100 | ||||||
9 | Diaphragm surface | 2.167 | Infinite size | 0.208 | |||||
10 | Fifth lens element | 5.000 | 5.601 | 0.872 | H-ZF88 | 1.945958 | 17.9439 | -9.38 | |
11 | Sixth lens element | 3.200 | 3.204 | 1.586 | H-FK61B | 1.496998 | 81.5947 | 3.80 | |
12 | 3.200 | -3.910 | 0.100 | ||||||
13 | Seventh lens element | 3.365 | -10.287 | 0.600 | H-ZLAF90 | 2.001 | 25.435 | -4.64 | |
14 | 3.774 | 9.034 | 0.108 | ||||||
15 | Eighth lens element | 4.313 | 14.609 | 0.828 | EP6000 | 1.639729 | 23.5288 | 45.64 | |
16 | 4.581 | 28.000 | 0.100 | ||||||
17 | Ninth lens | 5.413 | 4.552 | 2.759 | APL5015AL | 1.544514 | 56.0033 | 4.47 | |
18 | 5.721 | -4.185 | 0.100 | ||||||
19 | Cover glass | 5.880 | Infinite size | 0.800 | H-K9L | 1.516797 | 64.2124 | ||
20 | 5.964 | Infinite size | 2.601 | ||||||
21 | Image plane | 6.426 | Infinite size |
Fig. 26 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 27, it can be seen that when the spatial frequency of the lens reaches 1601p/mm, the full-field transfer function image is still greater than 35%, and the imaging quality is excellent. Referring to fig. 28, the defocus amount of the visible light in fig. 28 is less than 9 μm, and the confocal optical system has a confocal function and can be used for both day and night. Referring to fig. 29, it can be seen that the longitudinal aberration is less than ± 0.07mm, the color reduction is good, and the blue-violet phenomenon is not obvious. Referring to fig. 30, it can be seen that the distortion is less than-5%, the image is less in shape, the image is more accurate to restore the image, and the imaging quality is high.
The size of the imaging surface of all the embodiments is 1/2.8 inches, the lens resolution can reach 4K (3864 multiplied by 2192), the imaging quality is guaranteed, the light passing rate is about F/2.3, the ultrahigh imaging signal-to-noise ratio is achieved, meanwhile, the overall static resolution and video resolution of the scheme are greatly improved, and the development of later-stage image optimization algorithms is greatly facilitated.
The focal length of all the embodiments is 1.8-2.0 mm, the HFOV is 110-120 degrees, the TTL is less than 25mm, and F/2.3 is about, so that the lens has the advantages of wide field of view, large light transmission, compact structure, strong practicability and the like.
Above all embodiments all adopt the design of multi-disc plastics even order aspheric surface, under the prerequisite of having guaranteed wide angle low distortion formation of image, blue purple limit colour difference has been corrected, phenomenons such as blue purple limit can not appear during the formation of image, can better correction senior aberration, promote image quality, simultaneously, adopt glass to mould mixed design, not only the cost is equallyd divide to the plastics aspheric surface, make the low in manufacturing cost of camera lens, easily extensive volume production is used, promote product competitiveness, and the temperature drift volume is little, can offset the influence of temperature disturbance to formation of image quality, the picture is clear not out of focus, can guarantee when the camera lens uses in-40 ℃ to 85 ℃ temperature interval, the picture is clear not out of focus, can satisfy the operation requirement under most video conferencing and other harsher environment.
The overall F-tan (theta) distortion of the lens of all the above embodiments is less than-5%, and the deformation amount corresponding to the image and the object is small.
All the lens structures of the above embodiments adopt AF focusing modules, so that a simple optical automatic focusing process can be realized, the noise is low, the image jitter is low, the image is clear and cannot be defocused, and the reduction of focusing precision caused by gear transmission step-out accumulation can be prevented.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A wide-angle imaging lens for video transmission, comprising: the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens and the third lens are arranged along an optical axis from the object side to the image side;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a planar object-side surface and a concave image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the fourth lens is mutually glued with the object side surface of the fifth lens, the image side surface of the sixth lens is mutually glued with the object side surface of the seventh lens, the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens, the third lens, the eighth lens and the ninth lens are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fifth lens and the sixth lens.
2. A wide-angle imaging lens for video transmission as claimed in claim 1, wherein: the focal length ranges of the first to ninth lenses satisfy the following conditions:
-6< f1< -14, -6< f2< -4, -25< f3<23, 8< f4< -10, 4< f5<6, -11< f6< -9, -47< f7< -45, 6< f8<8, 12< f9<14, wherein f1, f2, f3, f4, f5, f6, f7, f8, f9 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, respectively.
3. A wide-angle imaging lens for video transmission as claimed in claim 2, wherein: the ratio of the focal length of the first, fourth, fifth, sixth and seventh lenses to the focal length of the lens satisfies the following relationship:
-8< (f1/f) < -6, 3< (f4/f) <5, 2< (f5/f) <3, -6< (f6/f) < -4, -24< (f7/f) < -22, wherein f is the focal length of the lens, and f1, f4, f5, f6, f7 are the focal length values of the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, respectively.
4. A wide-angle imaging lens for video transmission, comprising: the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens and the third lens are arranged along an optical axis from the object side to the image side;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a planar object-side surface and a concave image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the fourth lens is mutually glued with the object side surface of the fifth lens, the image side surface of the sixth lens is mutually glued with the object side surface of the seventh lens, the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens, the third lens, the eighth lens and the ninth lens are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fifth lens and the sixth lens.
5. A wide-angle imaging lens for video transmission, comprising: the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens and the third lens are arranged along an optical axis from the object side to the image side;
the first lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the sixth lens and the object side surface of the seventh lens are mutually glued, the third, fourth, fifth, sixth and seventh lenses are glass spherical lenses, the first, second, eighth and ninth lenses are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fourth lens and the fifth lens.
6. A wide-angle imaging lens for video transmission, comprising: the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens and the third lens are arranged along an optical axis from the object side to the image side;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the ninth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the image side surface of the fifth lens and the object side surface of the sixth lens are mutually glued, the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens, the third lens, the eighth lens and the ninth lens are plastic high-order even-order aspheric lenses, and a diaphragm is arranged between the fourth lens and the fifth lens.
7. A wide-angle imaging lens for video transmission as claimed in claim 1, 4, 5 or 6, wherein: the focusing mechanism is arranged on the base and is in transmission connection with the lens frame, and the focusing mechanism is used for adjusting the distance between the lens frame and the base so as to focus.
8. A wide-angle imaging lens for video transmission as defined in claim 7, wherein: focusing mechanism includes adjustable ring, gear train and motor, the top of base upwards extends and forms a connecting cylinder, be equipped with on the connecting cylinder the light trap, the adjustable ring includes inner link, outer ring and outer ring gear, inner link and picture frame outer wall looks spiro union, outer ring and connecting cylinder inner wall looks spiro union, just the screw thread pitch of inner link is greater than the screw thread pitch of outer link, outer ring gear is connected with the gear train transmission, the motor install in on the base, the output of motor passes through the gear train cooperates with output torque with the outer ring gear of adjustable ring.
9. A wide-angle imaging lens for video transmission as defined in claim 8, wherein: the focusing mechanism further comprises a permanent magnet and a Hall sensor, the permanent magnet is fixedly arranged on the lens frame and moves up and down along with the lens frame, and the Hall sensor is arranged on the base and used for sensing the position of the permanent magnet so as to position the lens barrel.
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