An endoscope imaging system and endoscope device

Abstract

The application discloses an endoscope imaging system and an endoscope device. The endoscope imaging system comprises, in sequence from the object side to the image side along the optical axis, a first window glass, an aperture, a lens sub-system, a second window glass and a detection imaging element. The lens sub-system comprises a first lens group with positive optical power, a second lens group with negative optical power and a third lens group with positive optical power. The object side surface of the first lens in the first sub-lens group, the second sub-lens group and the third sub-lens group in the first lens group is a convex surface from the object side to the image side along the optical axis, and the object side surface of the first lens in the second lens group is a concave surface from the object side to the image side along the optical axis, so that the aberrations of the endoscope imaging system can be balanced and calibrated, and the imaging effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the medical technical field, in particular to an endoscope imaging system and an endoscope device. BACKGROUND

[0002] At present, the endoscope device has become one of important tools for human to identify organ lesions, and is more and more popular in clinical application, and is a kind of medical instrument currently widely used. Among them, the endoscope imaging system is an important component of the endoscope device.

[0003] However, in the related art, the light incidence angle of the large imaging surface endoscope imaging system with large light deflection is large, which increases various aberrations in the endoscope imaging system, greatly affects the imaging effect of the endoscope imaging system. SUMMARY

[0004] In order to solve the above problems in the prior art, the embodiments of the present application provide an endoscope imaging system and an endoscope device, which are used to improve the imaging effect of the endoscope imaging system.

[0005] In a first aspect, the present application provides an endoscope imaging system, which comprises, in order from the object side to the image side along the optical axis, a first window glass, a diaphragm, a lens sub-system, a second window glass and a detection imaging element.

[0006] The first window glass and the second window glass are used to protect the lenses in the lens sub-system.

[0007] The detection imaging element is used to display an image formed by the lens sub-system.

[0008] The lens sub-system comprises, in order from the object side to the image side along the optical axis, a first lens group with positive focal power, a second lens group and a third lens group.

[0009] The first lens group is used to focus light, and comprises a first sub-lens group, a second sub-lens group and a third sub-lens group. The first sub-lens group comprises at least one lens, and the object side surface of the first lens in the first sub-lens group from the object side to the image side along the optical axis is a convex surface. The second sub-lens group comprises at least two lenses cemented together, and the object side surface of the first lens in the second sub-lens group from the object side to the image side along the optical axis is a convex surface. The third sub-lens group comprises at least two lenses cemented together, and the object side surface of the first lens in the third sub-lens group from the object side to the image side along the optical axis is a convex surface.

[0010] a second lens group with negative optical power for diverging light rays, the second lens group comprising at least two lenses cemented together, the object side surface of the first lens in the second lens group from the object side to the image side along the optical axis being concave;

[0011] a third lens group with positive optical power for converging light rays.

[0012] In a possible implementation, the first lens in the first sub-lens group from the object side to the image side along the optical axis is a first meniscus lens.

[0013] In a possible implementation, the first lens in the second sub-lens group from the object side to the image side along the optical axis is a first double convex lens, and the last lens is a first double concave lens.

[0014] the first lens in the third sub-lens group from the object side to the image side along the optical axis is a second double convex lens, and the last lens is a second double concave lens.

[0015] In a possible implementation, the second lens group comprises, in order from the object side to the image side along the optical axis, a third double concave lens, a third double convex lens, and a second meniscus lens, the third double concave lens, the third double convex lens, and the second meniscus lens being cemented together.

[0016] In a possible implementation, the third lens group comprises, in order from the object side to the image side along the optical axis, a fourth double convex lens and a fifth double convex lens.

[0017] In a possible implementation, the first lens group satisfies the following condition:

[0018] 0.7≤f1 / f≤0.9;

[0019] wherein f1 is the focal length of the first lens group, and f is the focal length of the endoscope imaging system.

[0020] In a possible implementation, the second lens group satisfies the following condition:

[0021] -0.4≤f2 / f≤-0.6;

[0022] wherein f2 is the focal length of the second lens group, and f is the focal length of the endoscope imaging system.

[0023] In a possible implementation, the third lens group satisfies the following condition:

[0024] 0.5≤f3 / f≤0.7;

[0025] wherein f3 is the focal length of the third lens group, and f is the focal length of the endoscope imaging system.

[0026] In a possible implementation, the endoscope imaging system satisfies the following conditions:

[0027] L1 / L≥0.7, and L2 / L1≤0.3;

[0028] wherein L1 represents the total thickness of each lens in the endoscope imaging system, L2 represents the total thickness of air between each lens in the endoscope imaging system, and L represents the sum of L1 and L2.

[0029] In a second aspect, the present application provides an endoscope device, which comprises the endoscope imaging system according to any one of the first aspect.

[0030] The technical scheme provided by the embodiments of the present application at least brings the following beneficial effects:

[0031] In the endoscope imaging system in the embodiments of the present application, along the optical axis from the object side to the image side, the endoscope imaging system comprises a first window glass, an aperture, a lens sub-system, a second window glass, and a detection imaging element in sequence. The lens sub-system comprises a first lens group with positive optical power, a second lens group with negative optical power, and a third lens group with positive optical power. The object side surface of the first lens in the first sub-lens group, the second sub-lens group, and the third sub-lens group in the first lens group along the optical axis from the object side to the image side is a convex surface, so as to collect sufficient light and meet the brightness requirement of high imaging effect. The object side surface of the first lens in the second lens group along the optical axis from the object side to the image side is a concave surface, which can effectively diverge the light collected by the first lens group, so as to balance the aberrations generated by the light collected by the first lens group and increase the size of the imaging surface. The positive optical power of the third lens group can balance the aberrations generated by the light collected by the second lens group. The endoscope imaging system thus designed can realize a larger imaging surface while reducing the light incidence angle of each lens group, so as to balance and correct the aberrations of the endoscope imaging system and improve the imaging effect. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A schematic diagram of the endoscope imaging system provided by the embodiments of the present application;

[0033] Figure 2 A schematic diagram of a first lens group provided by the embodiments of the present application;

[0034] Figure 3 A schematic diagram of a second sub-lens group provided by the embodiments of the present application;

[0035] Figure 4 A schematic diagram of a third sub-lens group provided by the embodiments of the present application;

[0036] Figure 5A schematic diagram of a second lens group provided for an embodiment of the present application;

[0037] Figure 6 A schematic diagram of a third lens group provided for an embodiment of the present application;

[0038] Figure 7 A schematic diagram of an endoscope imaging system provided for an embodiment of the present application;

[0039] Figure 8 A schematic diagram of another endoscope imaging system provided for an embodiment of the present application;

[0040] Figure 9 A visible light imaging schematic diagram provided for an embodiment of the present application;

[0041] Figure 10 A resolution schematic diagram provided for an embodiment of the present application;

[0042] Figure 11 A distortion schematic diagram provided for an embodiment of the present application;

[0043] Figure 12 A field curvature schematic diagram provided for an embodiment of the present application;

[0044] Figure 13 A chromatic aberration schematic diagram provided for an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The described embodiments are some embodiments of the present application, but not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0046] In addition, in the description of the embodiments of the present application, unless otherwise specified, “and”, “or” and “and / or” mean the meaning of “and / or”, for example, A / B can mean A or B; “and / or” in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0047] Specifically in the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. And, the "connection", "coupling" in the present application, if not specially stated, includes direct and indirect connection (coupling).

[0048] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0049] The design idea of the embodiments of the present application will be briefly introduced as follows:

[0050] Endoscope equipment is one of the important tools for human to identify organ lesions, and its application in clinics is becoming more and more popular, and it is a kind of medical instrument currently widely used. Among them, the endoscope imaging system is an important part of the endoscope equipment.

[0051] However, in the related art, the light incident angle of the large imaging surface endoscope imaging system with large light deflection is large, which increases the aberration in the endoscope imaging system, greatly affecting the imaging effect of the endoscope imaging system.

[0052] To solve the above problems, the endoscope imaging system in the embodiment of the present application comprises, in order from the object side to the image side along the optical axis, a first window glass, a diaphragm, a lens sub-system, a second window glass, and a detection imaging element. The lens sub-system comprises a first lens group with positive optical power, a second lens group with negative optical power, and a third lens group with positive optical power. The object side surface of the first lens in the first sub-lens group, the second sub-lens group, and the third sub-lens group in the first lens group is a convex surface from the object side to the image side along the optical axis, so as to collect sufficient light and meet the brightness requirement of high imaging effect. The object side surface of the first lens in the second lens group is a concave surface from the object side to the image side along the optical axis, which can effectively diverge the light collected by the first lens group, so as to balance the aberrations caused by the light collected by the first lens group and increase the size of the imaging surface. The positive optical power of the third lens group can balance the aberrations caused by the light collected by the second lens group, so that the endoscope imaging system designed in this way can realize a larger imaging surface while reducing the light incidence angle of each lens group, thereby balancing and correcting the aberrations of the endoscope imaging system and improving the imaging effect.

[0053] The embodiment of the present application provides an endoscope imaging system, which comprises, in order from the object side to the image side along the optical axis, a first window glass, a diaphragm, a lens sub-system, a second window glass, and a detection imaging element.

[0054] The first window glass and the second window glass are used for protecting the lenses in the lens sub-system, and the detection imaging element is used for displaying the image formed by the lens sub-system.

[0055] The lens sub-system in the embodiment of the present application comprises, in order from the object side to the image side along the optical axis,

[0056] The first lens group with positive optical power is used for focusing light, and the first lens group comprises a first sub-lens group, a second sub-lens group, and a third sub-lens group. The first sub-lens group comprises at least one lens, and the object side surface of the first lens in the first sub-lens group is a convex surface from the object side to the image side along the optical axis. The second sub-lens group comprises at least two lenses cemented together, and the object side surface of the first lens in the second sub-lens group is a convex surface from the object side to the image side along the optical axis. The third sub-lens group comprises at least two lenses cemented together, and the object side surface of the first lens in the third sub-lens group is a convex surface from the object side to the image side along the optical axis. The second lens group with negative optical power is used for diverging light, and the second lens group comprises at least two lenses cemented together, and the object side surface of the first lens in the second lens group is a concave surface from the object side to the image side along the optical axis. The third lens group with positive optical power is used for focusing light.

[0057] Figure 1A schematic diagram of an endoscope imaging system is provided in the embodiments of the present application. The endoscope imaging system comprises two parts, the first part is an adapter lens, and the second part is a detection imaging element. The adapter lens comprises a first window glass 01, a diaphragm 02, a lens sub-system 03 and a second window glass 04, and the detection imaging element 05 comprises a filter 051 and a detection imaging surface 052. The detection imaging element 05 can convert the light signal into an electrical signal to realize the capture of the image. The detection imaging element 05 can be a CMOS image sensor or a CCD image sensor, and the specific implementation mode of the detection imaging element can be selected according to different requirements, which is not limited in the present application.

[0058] The lens sub-system comprises a first lens group 031, a second lens group 032 and a third lens group 033.

[0059] Optionally, the diaphragm is a necessary part of the endoscope imaging system in the embodiments of the present application, which is arranged between the first window glass 01 and the lens sub-system 03.

[0060] As shown in the first lens group schematic diagram provided in the embodiments of the present application, Figure 2 the left side of the first lens group is the object side, and the right side of the first lens group is the image side.

[0061] Optionally, in the embodiments of the present application, the first lens group comprises a first sub-lens group, a second sub-lens group and a third sub-lens group from the object side to the image side. The object side surface of the first lens in the first sub-lens group, the second sub-lens group and the third sub-lens group in the first lens group from the object side to the image side along the optical axis is a convex surface, so as to collect sufficient light and meet the brightness requirement of high imaging effect.

[0062] Optionally, the first sub-lens group can comprise at least one lens, and the first lens in the first sub-lens group from the object side to the image side along the optical axis is a first meniscus lens.

[0063] In an optional embodiment, as shown in the first sub-lens group schematic diagram provided in the embodiments of the present application, Figure 2 the at least one lens in the first sub-lens group is a first meniscus lens 0311.

[0064] Optionally, the first lens in the second sub-lens group from the object side to the image side along the optical axis is a first biconvex lens, and the last lens is a first biconcave lens.

[0065] In an optional embodiment, as shown in the second sub-lens group schematic diagram provided in the embodiments of the present application, Figure 2 the first sub-lens group comprises a first biconvex lens 0312 and a first biconcave lens 0313 from the object side to the image side along the optical axis, and the first biconvex lens 0312 and the first biconcave lens 0313 are cemented together.

[0066] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together. Figure 3 In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0067] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0068] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together. Figure 2 In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0069] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together. Figure 4 In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0070] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0071] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together. Figure 5 In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0072] It should be noted that the second lens group in the embodiments of the present application has a negative focal power, and the object side surface of the first lens in the second lens group along the optical axis from the object side to the image side is concave, which can effectively diverge the light collected by the first lens group, thereby balancing the aberrations generated by the light collected by the first lens group and increasing the size of the imaging surface.

[0073] In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together. Figure 6 In another alternative embodiment, as shown in FIG. 3B, the third sub-lens group along the optical axis from the object side to the image side comprises a second biconvex lens 0314 and a second biconcave lens 0315 in sequence, and the second biconvex lens 0314 and the second biconcave lens 0315 are cemented together.

[0074] It should be noted that the third lens group in this embodiment has positive optical power, which can balance the aberrations generated by the second lens group collecting light, so that the incident angle of light on the detection imaging element is more matched with the detection imaging element, so that the light can be effectively transmitted to the detection imaging element, thereby balancing and calibrating the aberrations of the endoscope imaging system and improving the imaging effect.

[0075] The filter 051 is disposed between the second window glass 04 and the detection imaging surface 05 to filter the light beam.

[0076] based on Figures 1-6 The lens structure shown is a schematic diagram of an endoscopic imaging system according to an embodiment of this application. Figure 7 As shown. Among them, except for the first lens group, the second lens group, and the third lens group, the optical focal length of the remaining lenses is 0.

[0077] Optionally, in this embodiment, the diameters of the lenses in the second and third lens groups are both larger than the diameters of the lenses in the first lens group, so that the detection imaging surface can collect more light during the imaging process, thereby expanding the imaging surface.

[0078] It should be noted that the lenses in the endoscopic imaging system can be spherical or aspherical lenses, and this application does not impose any restrictions on this.

[0079] Optionally, the endoscopic imaging system of this application embodiment satisfies the following conditions:

[0080] L1 / L≥0.7, and L2 / L1≤0.3;

[0081] Where L1 represents the total thickness of all lenses in the endoscopic imaging system, L2 represents the total air thickness between all lenses in the endoscopic imaging system, and L represents the sum of L1 and L2.

[0082] like Figure 8 As shown in the embodiments of this application, L can characterize the total length of the optical system (i.e., the air between each lens in the endoscopic imaging system), and L1 can characterize the total thickness of each lens in the endoscopic imaging system. By using the condition L1 / L≥0.7, the total thickness of the lenses in the optical system can be limited. L2 can characterize the total air thickness between non-flat lenses. By using the condition L2 / L1≤0.3, the thickness of the air gap can be limited, making the lens gap smaller. In this way, the entire optical system is more compact, thereby ensuring that the endoscopic imaging system is shorter. At the same time, it also reduces the light incident angle of each lens group, so that the light can be effectively transmitted to the detection imaging element, thereby balancing and calibrating the aberrations of the endoscopic imaging system and improving the imaging effect.

[0083] Optionally, focal lengths of the first lens group, the second lens group and the third lens group in the embodiment of the present application respectively satisfy the following conditions:

[0084] The first lens group satisfies the following condition: 0.7≤f1 / f≤0.9

[0085] Wherein, f1 is the focal length of the first lens group; f is the focal length of the endoscope imaging system.

[0086] The second lens group satisfies the following condition: -0.4≤f2 / f≤-0.6

[0087] Wherein, f2 is the focal length of the second lens group; f is the focal length of the endoscope imaging system.

[0088] The third lens group satisfies the following condition: 0.5≤f3 / f≤0.7

[0089] Wherein, f3 is the focal length of the third lens group; f is the focal length of the endoscope imaging system.

[0090] Based on the endoscope imaging system as shown in Figure 7 , an embodiment of the present application is a visible light imaging schematic diagram. As shown in Figure 9 , after the visible light enters the endoscope imaging system, it is refracted by the lens in the endoscope imaging system, and finally the visible light is gathered on the imaging surface.

[0091] Wherein, the white light imaging resolution MTF is as shown in Figure 10 , which is basically close to the diffraction limit, and the average contrast reaches 0.2 at 200 lp / mm.

[0092] As shown in Figure 11 , an embodiment of the present application is a distortion schematic diagram. Wherein, the distortion is less than 1%, and the image deformation cannot be visually observed.

[0093] As shown in Figure 12 , an embodiment of the present application is a field curvature schematic diagram. Wherein, the field curvature is less than 0.05, and the image deformation cannot be visually observed.

[0094] As shown in Figure 13 , an embodiment of the present application is a chromatic aberration diagram. Wherein, the chromatic aberration of the present application is less than 1.5 microns, which is within the range of Airy disk and will not produce additional color deviation.

[0095] Those skilled in the art will appreciate that embodiments of the present application can be devised for a variety of other systems which are currently developed or later developed. Therefore, the present application is intended to cover all such modifications and variations of this application that are within the scope of the appended claims and their equivalents. It is intended that each element of claim 1 and 2 is independent of one another. No element of claim 1 and 2, or any other claim, is implied to depend on any other element or limitation of claim 1 and 2 or any other claim except where expressly recited in that claim.

[0096] The present application is described in reference to the flowchart and / or block diagrams of the method, apparatus (system) and computer program product according to this application. It will be understood that each block of the flowchart and / or block diagrams, and combinations of blocks in the flowchart and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 Figure 1

[0097] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and / or block diagram block or blocks. Figure 1 Figure 1

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 Figure 1

[0099] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.​​​​​​

Claims

1. An endoscopic imaging system, characterized in that, The endoscopic imaging system consists of a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element, arranged sequentially along the optical axis from the object side to the image side. The first window glass and the second window glass are used to protect the lenses in the lens subsystem. The detection imaging element is used to display the image formed by the lens subsystem; The lens subsystem consists of a first lens group with positive optical power, a second lens group with negative optical power, and a third lens group with positive optical power along the optical axis from the object side to the image side. The first lens group is used to focus light. The first lens group includes a first sub-lens group, a second sub-lens group, and a third sub-lens group. The first sub-lens group includes at least one lens. The first lens in the first sub-lens group from the object side to the image side along the optical axis is a first meniscus lens. The second sub-lens group includes at least two lenses cemented together. The first lens in the second sub-lens group from the object side to the image side along the optical axis is a first biconvex lens, and the last lens is a first biconcave lens. The third sub-lens group includes at least two lenses cemented together. The first lens in the third sub-lens group from the object side to the image side along the optical axis is a second biconvex lens, and the last lens is a second biconcave lens. The second lens group is used to diverge light. The second lens group includes at least two lenses cemented together. The second lens group consists of a third biconcave lens, a third biconvex lens, and a second meniscus lens in sequence from the object side to the image side along the optical axis. The third biconcave lens, the third biconvex lens, and the second meniscus lens are cemented together. The third lens group is used to focus light rays, and the third lens group consists of a fourth biconvex lens and a fifth biconvex lens in sequence along the optical axis from the object side to the image side; The endoscopic imaging system meets the following conditions: L1 / L≥0.7 and L2 / L1≤0.3; where L1 represents the total thickness of each lens in the endoscopic imaging system, L2 represents the total air thickness between each lens in the endoscopic imaging system, and L represents the sum of L1 and L2.

2. The endoscopic imaging system according to claim 1, characterized in that, The first lens group satisfies the following conditions: 0.7≤f1 / f≤0.9; Where f1 is the focal length of the first lens group, and f is the focal length of the endoscopic imaging system.

3. The endoscopic imaging system according to claim 1, characterized in that, The second lens group satisfies the following conditions: -0.4≤f² / f≤-0.6; Where f2 is the focal length of the second lens group; and f is the focal length of the endoscopic imaging system.

4. The endoscopic imaging system according to claim 1, characterized in that, The third lens group satisfies the following conditions: 0.5≤f³ / f≤0.7; Where f3 is the focal length of the third lens group; and f is the focal length of the endoscopic imaging system.

5. An endoscopic device, characterized in that, The endoscopic device includes the endoscopic imaging system as described in any one of claims 1-4.

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