High-resolution dual-path zoom lens and imaging device

Abstract

The application discloses a high-resolution dual-optical-path zoom lens and an imaging device, wherein the high-resolution dual-optical-path zoom lens comprises a lens main body, the direction from an object side to an image side of the lens main body along an optical axis of the lens main body is from front to back; the lens main body comprises a lens barrel, a fixed group and a moving group, the lens barrel is arranged in the front-back direction, and a cavity is formed in the lens barrel; the fixed group is fixed in the cavity and comprises a first lens group with positive refractive power and a fifth lens group with positive refractive power; the moving group is movably arranged in the cavity in the front-back direction and is located between the first lens group and the fifth lens group, and comprises a second lens group with negative refractive power, a third lens group with positive refractive power and a fourth lens group with positive refractive power, and the second lens group and the third lens group are movably arranged in linkage; that is, by arranging five lens groups and limiting the focal length ratio of the wide-angle end of the lens main body and the focal length of each lens group, the lens main body has the effects of large zoom ratio, high resolution and dual-optical-path.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens, in particular to a high-resolution dual optical path zoom lens and imaging device. BACKGROUND

[0002] With the development of society, people's safety awareness is constantly improved, and the security monitoring industry has also developed rapidly, and the role of zoom monitoring lens is also becoming more and more important. The resolution of the mainstream zoom monitoring lens is 1080P, and the detail restoration ability of the monitoring scene is not good. And when the zoom monitoring lens is in the night shooting mode, the monitoring system generally uses active infrared light compensation. Because the visible light of the monitoring scene is mixed with the infrared light of the auxiliary light compensation, the monitoring device cannot truly restore the color of the monitoring scene, and the output monitoring picture is generally black and white. SUMMARY

[0003] The main purpose of the present application is to provide a high-resolution dual optical path zoom lens and imaging device, aiming at improving the problem of low resolution of the existing zoom lens and insufficient color restoration in night shooting.

[0004] To achieve the above purpose, the present application provides a high-resolution dual optical path zoom lens, which comprises a lens main body, and the direction from the object side to the image side along the optical axis of the lens main body is from front to back;

[0005] The lens main body comprises:

[0006] A lens barrel is arranged in front and back directions, and a cavity is formed in the lens barrel;

[0007] A fixed group is fixed in the cavity and comprises a first lens group with positive focal length and a fifth lens group with positive focal length arranged in front and back directions in sequence;

[0008] A moving group is movably arranged in the cavity between the first lens group and the fifth lens group, and comprises a second lens group with negative focal length, a third lens group with positive focal length and a fourth lens group with positive focal length arranged in front and back directions in sequence, and the second lens group and the third lens group are movably arranged; and

[0009] The focal length of the lens main body at the wide-angle end is f w , the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5, which satisfy the following relationship:

[0010]

[0011] Optionally, the first lens group comprises, from front to back, a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, and a fifth lens with positive refractive power;

[0012] wherein a focal length of the first lens group is f1, a focal length of the first lens is f 11 , a focal length of the second lens is f 12 , a focal length of the third lens is f 13 , a focal length of the fourth lens is f 14 , a focal length of the fifth lens is f 15 , and the following relationship is satisfied:

[0013]

[0014] Optionally, an effective clear aperture of the first lens is Φ L11 , an optical total track length of the lens body is TTL, and

[0015] Optionally, the second lens group comprises, from front to back, a sixth lens with negative refractive power, a seventh lens with negative refractive power, an eighth lens with positive refractive power, and a ninth lens with negative refractive power;

[0016] wherein a focal length of the second lens group is f2, a focal length of the sixth lens is f 21 , a focal length of the seventh lens is f 22 , a focal length of the eighth lens is f 23 , a focal length of the ninth lens is f 24 , and the following relationship is satisfied:

[0017]

[0018] Optionally, the third lens group comprises, from front to back, a tenth lens with positive refractive power, an eleventh lens with positive refractive power, a twelfth lens with positive refractive power, and a thirteenth lens with negative refractive power;

[0019] wherein a focal length of the third lens group is f3, a focal length of the tenth lens is f 31 , a focal length of the eleventh lens is f 32 , a focal length of the twelfth lens is f 33 , a focal length of the thirteenth lens is f 34 , and the following relationship is satisfied:

[0020]

[0021] Optionally, the fourth lens group comprises a fourteenth lens having positive refractive power.

[0022] Optionally, the fifth lens group comprises, in order from front to back, a fifteenth lens having negative refractive power, a sixteenth lens having positive refractive power, a seventeenth lens having positive refractive power, and an eighteenth lens having negative refractive power.

[0023] wherein a focal length of the fifth lens group is f5, a focal length of the fifteenth lens is f 51 , a focal length of the sixteenth lens is f 52 , a focal length of the seventeenth lens is f 53 , a focal length of the eighteenth lens is f 54 , and the following relationship is satisfied:

[0024]

[0025] Optionally, the second lens group is movable from front to back to enable the lens body to be adjusted from a wide-angle end to a telephoto end, and a relative displacement amount of a front vertex of the second lens group when the lens body is at the wide-angle end and the telephoto end is ΔZ1 W-T , an optical total length of the lens body is TTL, and and / or,

[0026] the third lens group is movable from back to front to enable the lens body to be adjusted from a wide-angle end to a telephoto end, and a relative displacement amount of a front vertex of the third lens group when the lens body is at the wide-angle end and the telephoto end is ΔZ2 W-T , an optical total length of the lens body is TTL, and

[0027] Optionally, the high-resolution dual-optical-path zoom lens further comprises a diaphragm arranged in the cavity, the diaphragm being between the second lens group and the third lens group; and / or,

[0028] The high-resolution dual-optical-path zoom lens further comprises a light splitting element arranged in the cavity, the light splitting element being on a rear side of the fifth lens group.

[0029] The present application also provides an imaging device comprising the high-resolution dual-optical-path zoom lens described above.

[0030] In the technical solution of this invention, the first lens group and the fifth lens group are fixedly installed in the inner cavity, and the second lens group, the third lens group, and the fourth lens group are disposed in the inner cavity and can move along the front-back direction. The second lens group and the third lens group are used for zooming, and the fourth lens group is used for focusing. During the linkage of the second lens group and the third lens group, the lens body can zoom from the wide-angle end to the telephoto end. Furthermore, during the movement of the fourth lens group relative to the second lens group and the third lens group in the front-back direction, it can complete the interaction with the second lens group and the fifth lens group. The position, imaging wavelength, and imaging object distance of the three lens groups correspond to the movement focus, enabling the lens body to maintain image clarity during zooming. Simultaneously, the first lens group has positive optical power, the second lens group has negative optical power, the third lens group has positive optical power, the fourth lens group has positive optical power, and the fifth lens group has positive optical power. By arranging the first to fifth lens groups sequentially from front to back and limiting the ratio of the focal length of the lens body at the wide-angle end to the focal length of each lens group, the lens body can achieve a large zoom ratio, high resolution, and dual-optical-path effects. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments and / or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of the high-resolution dual-optical-path zoom lens (at the wide-angle end) provided by the present invention;

[0033] Figure 2 for Figure 1 A spherical aberration image of a high-resolution dual-path zoom lens at the wide-angle end;

[0034] Figure 3 for Figure 1 Field curvature diagram of a high-resolution dual-path zoom lens at the wide-angle end;

[0035] Figure 4 for Figure 1 The distortion image of the high-resolution dual-path zoom lens at the wide-angle end;

[0036] Figure 5 A schematic diagram of the structure of the high-resolution dual-optical-path zoom lens (at intermediate magnification) provided by the present invention;

[0037] Figure 6 for Figure 5 The high-resolution dual-path zoom lens in the image is located at the middle magnification spherical aberration map;

[0038] Figure 7 for Figure 5 The high-resolution dual-path zoom lens in the middle magnification field curve diagram;

[0039] Figure 8 for Figure 5 The high-resolution dual-path zoom lens in the image exhibits distortion at an intermediate magnification.

[0040] Figure 9 A schematic diagram of the structure of the high-resolution dual-optical-path zoom lens (at the telephoto end) provided by the present invention;

[0041] Figure 10 for Figure 9 A spherical aberration image of a high-resolution dual-path zoom lens at the telephoto end;

[0042] Figure 11 for Figure 9 Field curvature diagram of a high-resolution dual-path zoom lens at the telephoto end;

[0043] Figure 12 for Figure 9 The distortion image of the high-resolution dual-path zoom lens at the telephoto end.

[0044] Explanation of reference numerals in the accompanying drawings of the embodiments provided in this invention:

[0045] Reference Name Reference Name 1000 High-resolution dual-optical-path zoom lens 34 Thirteenth lens 100 Lens body 4 Fourth lens group 1 First lens group 41 Fourteenth lens 11 First lens 5 Fifth lens group 12 Second lens 51 Fifteenth lens 13 Third lens 52 Sixteenth lens 14 Fourth lens 53 Seventeenth lens 15 Fifth lens 54 Eighteenth lens 2 Second lens group 6 Diaphragm 21 Sixth lens 7 Photosensitive chip 22 Seventh lens 71 First photosensitive chip 23 Eighth lens 72 Second photosensitive chip 24 Ninth lens 8 Light splitting element 3 Third lens group 9 Filter 31 Tenth lens 91 First filter 32 Eleventh lens 92 Second filter 33 Twelfth lens

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] 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, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0049] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0050] With the development of society, people's safety awareness is constantly improved, and the security monitoring industry also develops rapidly, and the zoom monitoring lens plays a more and more important role. At present, the mainstream zoom monitoring lens resolution is 1080P, and its monitoring scene detail restoration ability is not good. And when the zoom monitoring lens is in night shooting mode, the monitoring system generally uses active infrared light compensation. Because the visible light and the auxiliary light compensation infrared light of the monitoring scene are mixed, the monitoring device cannot truly restore the color of the monitoring scene, and the output monitoring picture is generally black and white.

[0051] In view of this, the present application provides a high-resolution dual optical path zoom lens and an imaging device, aiming at improving the problem of low resolution of the existing zoom lens and insufficient color restoration in night shooting. Figures 1-12 The specific embodiments of the high-resolution dual optical path zoom lens provided by the present application.

[0052] Please refer to Figures 1-12 In the embodiment, the high-resolution dual optical path zoom lens 1000 includes a lens body 100, and the direction from the object side to the image side along the optical axis of the lens body 100 is from front to back; the lens body 100 includes a lens barrel (not shown in the figure), a fixed group and a moving group, the lens barrel is arranged in front and back direction, and a cavity is formed in the lens barrel; the fixed group is fixed in the cavity and includes a first lens group 1 with positive focal length and a fifth lens group 5 with positive focal length arranged in front and back direction in sequence; the moving group is movably arranged in the cavity between the first lens group 1 and the fifth lens group 5, and includes a second lens group 2 with negative focal length, a third lens group 3 with positive focal length and a fourth lens group 4 with positive focal length arranged in front and back direction in sequence, and the second lens group 2 and the third lens group 3 are connected and arranged; wherein the focal length of the lens body 100 at the wide-angle end is f w, the focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, the focal length of the third lens group 3 is f3, the focal length of the fourth lens group 4 is f4, and the focal length of the fifth lens group 5 is f5, the following relationship is satisfied:

[0053]

[0054] In the technical solution of the present application, the first lens group 1 and the fifth lens group 5 are fixedly installed in the inner cavity, and the second lens group 2, the third lens group 3, and the fourth lens group 4 are arranged in the inner cavity and can move forward and backward. The second lens group 2 and the third lens group 3 are used for zooming, and the fourth lens group 4 is used for focusing. During the linkage of the second lens group 2 and the third lens group 3, the lens body 100 can be zoomed from the wide-angle end to the telephoto end. During the movement of the fourth lens group 4 relative to the second lens group 2 and the third lens group 3, the position, imaging wavelength, and imaging object distance of the second lens group 2 and the third lens group 3 can be adjusted, so that the lens body 100 can keep clear imaging during zooming. In addition, the first lens group 1 has positive refractive power, the second lens group 2 has negative refractive power, the third lens group 3 has positive refractive power, the fourth lens group 4 has positive refractive power, and the fifth lens group 5 has positive refractive power. By arranging the first lens group 1 to the fifth lens group 5 from front to back and limiting the ratio of the focal length of the lens body 100 at the wide-angle end to the focal length of each lens group, the lens body 100 can have a large zoom ratio, high resolution, and double optical path effect.

[0055] It should be noted that the second lens group 2, the third lens group 3, and the fourth lens group 4 can move forward and backward after being driven by external force. The external force can be a driving motor or manual adjustment, which is not limited herein.

[0056] Specifically, in the present embodiment, the focal length of the lens body 100 at the wide-angle end is f w , the focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, the focal length of the third lens group 3 is f3, the focal length of the fourth lens group 4 is f4, and the focal length of the fifth lens group 5 is f5, wherein,

[0057] In the present application, the first lens group 1 comprises, from front to back, a first lens 11 with negative refractive power, a second lens 12 with positive refractive power, a third lens 13 with positive refractive power, a fourth lens 14 with positive refractive power, and a fifth lens 15 with positive refractive power; wherein the focal length of the first lens group 1 is f1, the focal length of the first lens 11 is f 11 , the focal length of the second lens 12 is f 12 , the focal length of the third lens 13 is f 13 , the focal length of the fourth lens 14 is f 14 , the focal length of the fifth lens 15 is f 15 , and the following relationships are satisfied:

[0058]

[0059] More specifically, in the present embodiment, the first lens 11 is configured as a convex-concave spherical lens with negative refractive power, i.e. the object side of the first lens 11 is convex and the image side is concave, the second lens 12 is configured as a convex-concave spherical lens with positive refractive power, the third lens 13 is configured as a convex-plane spherical lens with positive refractive power; the fourth lens 14 is configured as a convex-concave spherical lens with positive refractive power, and the fifth lens 15 is configured as a convex-concave spherical lens with positive refractive power, the focal length of the first lens group 1 is f1, the focal length of the first lens 11 is f 11 , the focal length of the second lens 12 is f 12 , the focal length of the third lens 13 is f 13 , the focal length of the fourth lens 14 is f 14 , and the focal length of the fifth lens 15 is f 15 , wherein

[0060] Meanwhile, in the present embodiment, the first lens 11 and the second lens 12 are cemented to form a first cemented lens. The refractive index of the first lens 11 is ND 11 , the refractive index of the second lens 12 is ND 12 , the refractive index of the third lens 13 is ND 13 , the refractive index of the fourth lens 14 is ND 14 , the refractive index of the fifth lens 15 is ND 15 , the Abbe number of the first lens 11 is VD 11 , the Abbe number of the second lens 12 is VD 12 , the Abbe number of the third lens 13 is VD 13 , the Abbe number of the fourth lens 14 is VD 14, the Abbe number of the fifth lens 15 is VD 15 , the following relationship is satisfied:

[0061] 1.7 < ND 11 <2.0, 1.4 < ND 12 <1.7, 1.4 < ND 13 <1.7, 1.4 < ND 14 <1.7, 1.4 < ND 15 <1.7; 20 < VD 11 <40, and 60 < VD 12 <100, 60 < VD 13 <100, 60 < VD 14 <100, 60 < VD 15 <100.

[0062] In particular, the second lens group 2 includes, in order from the front to the back, a sixth lens 21 having a negative refractive power, a seventh lens 22 having a negative refractive power, an eighth lens 23 having a positive refractive power, and a ninth lens 24 having a negative refractive power; wherein the focal length of the second lens group 2 is f2, the focal length of the sixth lens 21 is f 21 , the focal length of the seventh lens 22 is f 22 , the focal length of the eighth lens 23 is f 23 , the focal length of the ninth lens 24 is f 24 , the following relationship is satisfied:

[0063]

[0064] More specifically, in the present embodiment, the sixth lens 21 is provided as a convex-concave spherical lens having a negative refractive power, the seventh lens 22 is provided as an aspherical lens, the eighth lens 23 is provided as a convex-concave spherical lens having a positive refractive power, the ninth lens 24 is provided as an aspherical spherical lens, the focal length of the second lens group 2 is f2, the focal length of the sixth lens 21 is f 21 , the focal length of the seventh lens 22 is f 22 , the focal length of the eighth lens 23 is f 23 , the focal length of the ninth lens 24 is f 24 , and

[0065] In particular, the third lens group 3 includes, in order from the front to the back, a tenth lens 31 having a positive refractive power, an eleventh lens 32 having a positive refractive power, a twelfth lens 33 having a positive refractive power, and a thirteenth lens 34 having a negative refractive power; wherein the focal length of the third lens group 3 is f3, the focal length of the tenth lens 31 is f31 The focal length of the eleventh lens 32 is f 32 The focal length of the twelfth lens 33 is f 33 The focal length of the thirteenth lens 34 is f 34 The following relationship is satisfied:

[0066]

[0067] Meanwhile, in the embodiment of the present application, the twelfth lens 33 and the thirteenth lens 34 form a second cemented lens by cementing.

[0068] More specifically, in the embodiment, the tenth lens 31 is arranged as a biconvex aspheric lens with positive refractive power, the eleventh lens 32 is arranged as a biconvex spherical lens with positive refractive power, the twelfth lens 33 is arranged as a biconvex spherical lens with positive refractive power, the thirteenth lens 34 is arranged as a biconcave spherical lens with negative refractive power, the focal length of the third lens group 3 is f3, the focal length of the tenth lens 31 is f 31 The focal length of the eleventh lens 32 is f 32 The focal length of the twelfth lens 33 is f 33 The focal length of the thirteenth lens 34 is f 34 And

[0069] Specifically, the fourth lens group 4 includes a fourteenth lens 41 with positive refractive power.

[0070] Specifically, the fifth lens group 5 includes, from front to back, a fifteenth lens 51 with negative refractive power, a sixteenth lens 52 with positive refractive power, a seventeenth lens 53 with positive refractive power, and an eighteenth lens 54 with negative refractive power; wherein the focal length of the fifth lens group 5 is f5, the focal length of the fifteenth lens 51 is f 51 The focal length of the sixteenth lens 52 is f 52 The focal length of the seventeenth lens 53 is f 53 The focal length of the eighteenth lens 54 is f 54 The following relationship is satisfied:

[0071]

[0072] More specifically, in the present embodiment, the fifteenth lens 51 is arranged as a biconcave aspheric lens having a negative focal power, the sixteenth lens 52 is arranged as a biconvex spherical lens having a positive focal power, the seventeenth lens 53 is arranged as a concave-convex spherical lens having a positive focal power, the eighteenth lens 54 is arranged as a concave-convex aspheric lens having a negative focal power, the focal length of the fifth lens group 5 is f5, the focal length of the fifteenth lens 51 is f 51 , the focal length of the sixteenth lens 52 is f 52 , the focal length of the seventeenth lens 53 is f 53 , the focal length of the eighteenth lens 54 is f 54 , and

[0073] Specifically, the first lens group 1 comprises, from front to back, a first lens 11 having a negative focal power, a second lens 12 having a positive focal power, a third lens 13 having a positive focal power, a fourth lens 14 having a positive focal power, and a fifth lens 15 having a positive focal power; the effective clear aperture of the first lens 11 is Φ L11 , the optical total length of the lens barrel 100 is TTL, and

[0074] More specifically, in the present embodiment, the effective clear aperture of the first lens 11 is Φ L11 , the optical total length of the lens barrel 100 is TTL, and

[0075] In the present application, the second lens group 2 is movable from front to back so as to enable the lens barrel 100 to be adjusted from a wide-angle end to a telephoto end, and the relative displacement amount of the front vertex of the second lens group 2 when the lens barrel 100 is in the wide-angle end and the telephoto end positions is ΔZ1 W-T , the optical total length of the lens barrel 100 is TTL, and

[0076] In the present application, the third lens group 3 is movable from back to front so as to enable the lens barrel 100 to be adjusted from a wide-angle end to a telephoto end, and the relative displacement amount of the front vertex of the third lens group 3 when the lens barrel 100 is in the wide-angle end and the telephoto end positions is ΔZ2 W-T , the optical total length of the lens barrel 100 is TTL, and

[0077] It should be noted that the above two technical features can be set alternatively or simultaneously, specifically, in the embodiment, the above two technical features are set simultaneously, that is, the relative displacement amount of the front vertex of the second lens group 2 when the lens barrel 100 is at the wide-angle end position and when the lens barrel 100 is at the telephoto end position is ΔZ1 W-T , the optical total length of the lens barrel 100 is TTL, and the relative displacement amount of the front vertex of the third lens group 3 when the lens barrel 100 is at the wide-angle end position and when the lens barrel 100 is at the telephoto end position is ΔZ2 W-T , the optical total length of the lens barrel 100 is TTL, and

[0078] More specifically, in the embodiment, the relative displacement amount of the front vertex of the second lens group 2 when the lens barrel 100 is at the wide-angle end position and when the lens barrel 100 is at the telephoto end position is ΔZ1 W-T , the relative displacement amount of the front vertex of the third lens group 3 when the lens barrel 100 is at the wide-angle end position and when the lens barrel 100 is at the telephoto end position is ΔZ2 W-T , the optical total length of the lens barrel 100 is TTL, and

[0079] In the application, the high-resolution dual-optical-path zoom lens 1000 further comprises a diaphragm 6 arranged in the cavity, the diaphragm 6 is between the second lens group 2 and the third lens group 3, the diaphragm 6 is an adjustable diaphragm, the adjustable diaphragm can be scaled according to the change of the ambient light intensity; the position and the size of the light transmission hole of the diaphragm 6 are directly related to the brightness, the clarity and the size of the partial aberration of the image formed by the lens barrel 100, and the diaphragm 6 is arranged between the second lens group 2 and the third lens group 3, so that the lens barrel 100 can achieve a more appropriate brightness and clarity of the formed image during zooming.

[0080] In the application, the high-resolution dual-optical-path zoom lens 1000 further comprises a light splitting element 8 arranged in the cavity, the light splitting element 8 is at the rear side of the fifth lens group 5; the light splitting element 8 is a light splitter, which is a passive device, also known as an optical splitter, and it does not need external energy, but only needs input light. The light splitter is composed of an incident and exit slit, a mirror and a dispersion element, and its function is to separate the required resonance absorption line.

[0081] It should be noted that the above two technical features can be set alternatively or simultaneously. Specifically, in the present embodiment, the above two technical features are set simultaneously, that is, the high-resolution dual-optical-path zoom lens 1000 further comprises a diaphragm 6 and a light splitting element 8 arranged in the cavity, the diaphragm 6 is arranged between the second lens group 2 and the third lens group 3, and the light splitting element 8 is arranged at the rear side of the fifth lens group 5. The diaphragm 6 is arranged between the second lens group 2 and the third lens group 3, so that the lens body 100 can achieve a more appropriate bright degree and clarity of imaging during zooming. The light splitting element 8 is arranged to separate the required resonance absorption line.

[0082] It should be noted that the smaller the light passing hole of the diaphragm 6, the smaller the spherical aberration, the clearer the image, the larger the depth of field, but the weaker the bright degree of the image; on the contrary, the larger the light passing hole of the diaphragm 6, the stronger the bright degree of the image, the larger the spherical aberration, the worse the relative clarity, and the smaller the depth of field. Therefore, in the present embodiment, the light passing hole of the diaphragm 6 can be set as a fixed size or adjustable within a certain size range.

[0083] In addition, in order to ensure the bright degree, clarity and partial aberration of the image formed by the high-resolution dual-optical-path zoom lens 1000, the distance from the diaphragm 6 to the imaging surface of the lens body 100 in the front-rear direction is L, the total optical length of the lens body 100 is TTL, and the following relationship is satisfied: It should be noted that the total optical length is the distance from the object side center vertex of the first lens 11 to the imaging surface of the lens body 100.

[0084] Specifically, in the present embodiment, the distance from the diaphragm 6 to the imaging surface of the lens body 100 in the front-rear direction is L, the total optical length of the lens body 100 is TTL, and

[0085] It should be noted that the high-resolution dual-optical-path zoom lens 1000 further comprises a filter 9 arranged at the rear side of the fifth lens group 5 and a photosensitive chip 7, and the surface of the photosensitive chip 7 facing the object side is an imaging surface.

[0086] Specifically, the light splitting element 8 is used to separate the visible light path and the infrared light path, and the high-resolution dual-optical-path zoom lens 1000 further comprises a first photosensitive chip 71, a second photosensitive chip 72, a first filter 91 and a second filter 92, the first filter 91 and the first photosensitive chip 71 are arranged at the rear side of the light splitting element 8, and the second filter 92 and the second photosensitive chip 72 are arranged at the upper side of the light splitting element 8, so that the visible light and the infrared light are imaged on the first photosensitive chip 71 and the second photosensitive chip 72, respectively.

[0087] Specifically, the imaging surface can be understood as the surface of the photosensitive chip 7 facing the object side, i.e. the surface of a CCD or CMOS or the like image pickup element. More specifically, in the present embodiment, the imaging surface is the surface of a CMOS solid-state image pickup element (the size of the CMOS in the present embodiment is 1 / 1.8" inch H*V=7.68mm*4.32mm). It can be understood that the light carrying the object information can sequentially pass through the first lens group 1, the second lens group 2, the diaphragm 6, the third lens group 3, the fourth lens group 4, the fifth lens group 5, the light splitting element 8, the first filter 91 and the second filter 92, and be separated into visible light and infrared light, and finally correspondingly imaged on the first photosensitive chip 71 and the second photosensitive chip 72 respectively.

[0088] Specifically, in the present embodiment, the parameters of the high-resolution dual-optical-path zoom lens 1000 are as follows: the focal length fw=6.86mm at the wide-angle end, the focal length ft=137.52mm at the telephoto end; the aperture number Fno w =1.6 at the wide-angle end, the aperture number Fno T =3.8 at the telephoto end; the optical distortion range is between -8% and 2.5%; the total optical length of the zoom lens TTL=142.2mm.

[0089] Specifically, in the present embodiment, the refractive index, the radius of curvature and the thickness interval of the lenses are as shown in the following table:

[0090] Table 1 Parameters of the lenses

[0091]

[0092]

[0093]

[0094] In the present embodiment, the seventh lens 22, the ninth lens 24, the tenth lens 31, the fifteenth lens 51 and the eighteenth lens 54 are aspherical lenses. It should be noted that the aspherical lens has the following characteristics: from the center of the lens to the periphery of the lens, the curvature is continuously changed, which is different from the spherical lens having a constant curvature from the center of the lens to the periphery of the lens. The aspherical lens has better radius of curvature characteristics, has the advantages of improving the distortion aberration and improving the astigmatism aberration, and after using the aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens.

[0095] Further, in the present embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:

[0096]

[0097] Wherein, c is the curvature corresponding to the radius, y is the radial coordinate (its unit and the lens length unit are same), k is the conic quadratic curve coefficient, (when the k coefficient is less than-1, the surface shape curve is hyperbola, when the k coefficient is equal to-1, it is parabola, when the k coefficient is between-1 and 0, it is ellipse, when the k coefficient is equal to 0, it is circle, when the k coefficient is greater than 0, it is oblate), A, B, C, D, E, F are high-order aspherical surface coefficients (please refer to Table 2 below), the shape and size of the lens object side and image side aspherical surface can be set through the above parameters.

[0098] Table 2 Conic coefficient and aspherical surface coefficient corresponding to aspherical surface lens

[0099]

[0100] Table 3 Zoom data of the zoom lens at wide-angle end, intermediate magnification position and telephoto end respectively

[0101]

[0102]

[0103] In the application, the zoom lens adopts a five-group structure of "positive-negative-positive-positive-positive", which includes two zoom groups, one focusing group and two fixed groups. With the corresponding movement of the second lens group 2 and the third lens group 3, the focal length changes, and the fourth lens group 4 is used for focusing. Specifically, taking a 1 / 1.8", 16:9 photosensitive chip as an example, the focal length can reach 6.86mm at the wide-angle end and 137.5mm at the telephoto end.

[0104] The light splitting element 8 realizes the separation of the visible light path and the infrared light path, so that the visible light and the infrared light are imaged on different imaging surfaces respectively, and then the software processing is performed to realize the shooting of colorful pictures in the dark environment.

[0105] The lens main body 100 uses an adjustable diaphragm, and the aperture number reaches 1.6 at the wide-angle end and 3.8 at the telephoto end.

[0106] The distance position between the first lens group 1 and the photosensitive chip 7 is fixed, and the distance between the first lens group 1 and the photosensitive chip 7 can be adjusted according to the size of the actually selected photosensitive chip. Taking a 1 / 1.8", 16:9 photosensitive chip as an example, the distance between the first lens group 1 and the photosensitive chip 7 is 142.2mm.

[0107] The zoom lens can reach a resolution higher than 4K (80 million pixels), a center resolution higher than 1800 TV lines, and a 0.7H (70% diagonal position) peripheral resolution higher than 1600 TV lines.

[0108] In addition, the application further provides an imaging device comprising the high-resolution dual-optical-path zoom lens 1000 described in the technical solutions above. It should be noted that the detailed structure of the high-resolution dual-optical-path zoom lens 1000 in the imaging device can refer to the embodiments of the high-resolution dual-optical-path zoom lens 1000 described above, which will not be described here again. Since the high-resolution dual-optical-path zoom lens 1000 described above is used in the imaging device of the application, the embodiments of the imaging device of the application include all the technical solutions of all the embodiments of the high-resolution dual-optical-path zoom lens 1000 described above, and the technical effects achieved are also completely the same, which will not be described here again.

[0109] The above description is only the preferred embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation made by using the content of the specification and drawings, or direct / indirect application in other related technical fields within the concept of the application is included in the patent protection scope of the application.

Claims

1. A high resolution dual optical path zoom lens characterized by, The lens barrel includes a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; The lens barrel includes: a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; wherein a focal length of the lens body at a wide angle end is f w , a focal length of the first lens group is f1, a focal length of the second lens group is f2, a focal length of the third lens group is f3, a focal length of the fourth lens group is f4, and a focal length of the fifth lens group is f5, and the following relational expressions are satisfied: 0.082< <0.123，-0.671< <-0.448，0.196< <0.294，0.112< <0.168，0.047< <0.071； a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side; a lens barrel body, a front side and a rear side along an optical axis of the lens barrel body from the front side to the rear side.

2. The high resolution dual optical path zoom lens of claim 1, wherein, a focal length of the first lens group is f1, a focal length of the first lens is f 11 , a focal length of the second lens is f 12 , a focal length of the third lens is f 13 , a focal length of the fourth lens is f 14 , a focal length of the fifth lens is f 15 , the following relational expression is satisfied: -0.565< <-0.377，0.321< <0.481，0.341< <0.511，0.244< <0.366，0.324< <0.485。 3. The high resolution dual optical path zoom lens of claim 2, wherein, An effective light aperture of the first lens is Φ L11 , an optical total length of the lens body is TTL, and 0.321 <0.

392.

4. The high resolution dual optical path zoom lens of claim 1, wherein, a focal length of the second lens group is f2, a focal length of the sixth lens is f 21 , a focal length of the seventh lens is f 22 , a focal length of the eighth lens is f 23 , a focal length of the ninth lens is f 24 , and the following relational expression is satisfied: 0.629< <0.944，0.087< <0.13，-0.459< <-0.306，0.355< <0.533。 5. The high resolution dual optical path zoom lens of claim 1, wherein, a focal length of the third lens group is f3, a focal length of the tenth lens is f 31 , a focal length of the eleventh lens is f 32 , a focal length of the twelfth lens is f 33 , a focal length of the thirteenth lens is f 34 , and the following relational expression is satisfied: 0.801< <1.202，0.421< <0.631，0.939< <1.408，-2.377< <-1.584。 6. The high resolution dual optical path zoom lens of claim 1, wherein, a focal length of the fifth lens group is f5, a focal length of the fifteenth lens is f 51 a focal length of the sixteenth lens is f 52 a focal length of the seventeenth lens is f 53 a focal length of the eighteenth lens is f 54 the following relationship is satisfied: -8.026< <-5.351，4.709< <7.064，1.62< <2.429，-2.008< <-1.339。 7. The high resolution dual optical path zoom lens of claim 1, wherein, The second lens group moves from front to back to enable the lens barrel to be adjusted from a wide-angle end to a telephoto end, and the relative displacement amount of the front vertex of the second lens group when the lens barrel is at the wide-angle end and the telephoto end is ΔZ1W-T, the total optical length of the lens barrel is TTL, and 0.264 <0.343; and / or, The third lens group is movable from back to front to enable the lens barrel to be adjusted from a wide-angle end to a telephoto end, and the amount of relative displacement of the front vertex of the third lens group when the lens barrel is at the wide-angle end and the telephoto end is ΔZ2W-T, the total optical length of the lens barrel is TTL, and 0.097 <0.

145.

8. The high resolution dual optical path zoom lens of claim 1, wherein, The high-resolution dual-optical-path zoom lens further includes a diaphragm disposed in the cavity, the diaphragm being located between the second lens group and the third lens group; and / or, The high-resolution dual-optical-path zoom lens further includes a light splitting element disposed in the cavity, the light splitting element being located at a rear side of the fifth lens group.

9. An image forming apparatus characterized by comprising: The high-resolution dual-optical-path zoom lens includes any one of claims 1 to 8.

Images