Endoscope imaging system and endoscope equipment

Abstract

The invention discloses an endoscope imaging system and endoscope equipment. The endoscope imaging system sequentially comprises first window glass, a diaphragm, a lens subsystem, second window glass and a detection imaging element from an object side to an image side along an optical axis, the lens subsystem comprises a first lens group with positive focal power, a second lens group with negative focal power and a third lens group with positive focal power. Wherein in the first sub-lens group, the second sub-lens group and the third sub-lens group in the first lens group, the object side surface of the first lens from the object side to the image side along the optical axis is a convex surface, and the object side surface of the first lens from the object side to the image side along the optical axis in the second lens group is a concave surface, so that various aberrations of the endoscope imaging system can be balanced and calibrated; the imaging effect is improved.

Description

Technical Field

[0001] The present application relates to the field of medical technology, and in particular to an endoscopic imaging system and an endoscopic device. Background Art

[0002] At present, endoscope equipment has become one of the important tools for humans to identify organ lesions, and its clinical application is becoming more and more popular. It is a very widely used medical device. Among them, the endoscope imaging system is an important part of the endoscope equipment.

[0003] However, in the related art, the light incident angle of the endoscopic imaging system with a large imaging surface that requires a large light deflection is large, which increases the various aberrations in the endoscopic imaging system and greatly affects the imaging effect of the endoscopic imaging system. Summary of the invention

[0004] In order to solve the above-mentioned problems in the prior art, an embodiment of the present application provides an endoscopic imaging system and an endoscopic device, which are used to improve the imaging effect of the endoscopic imaging system.

[0005] In a first aspect, the present application provides an endoscopic imaging system, which includes, from the object side to the image side along the optical axis, a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element;

[0006] Wherein, the first window glass and the second window glass are used to protect the lens in the lens subsystem;

[0007] The detection imaging element is used to display the image formed by the lens subsystem;

[0008] The lens subsystem includes, in order from the object side to the image side along the optical axis:

[0009] A first lens group with positive optical power, 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 object side surface of the first lens along the optical axis from the object side to the image side in the first sub-lens group is a convex surface, the second sub-lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the second sub-lens group is a convex surface, the third sub-lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the third sub-lens group is a convex surface;

[0010] a second lens group with negative optical power, the second lens group being used to diverge light, the second lens group comprising at least two lenses cemented together, 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 a concave surface;

[0011] A third lens group with positive optical power is used to focus the light.

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

[0015] In a possible implementation, the second lens group includes, in sequence from the object side to the image side along the optical axis, a third biconcave lens, a third biconvex lens, and a second meniscus lens, wherein the third biconcave lens, the third biconvex lens, and the second meniscus lens are glued together.

[0016] In a possible implementation, the third lens group includes a fourth biconvex lens and a fifth biconvex lens in sequence from the object side to the image side along the optical axis.

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

[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 manner, the second lens group satisfies the following conditions:

[0021] -0.4≤f2 / f≤-0.6;

[0022] Among them, f2 is the focal length of the second lens group; f is the focal length of the endoscope imaging system.

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

[0024] 0.5≤f3 / f≤0.7;

[0025] Among them, f3 is the focal length of the third lens group; f is the focal length of the endoscope imaging system.

[0026] In a possible implementation, the endoscopic 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 endoscopic imaging system, L2 represents the total thickness of air between each lens in the endoscopic imaging system, and L represents the sum of L1 and L2.

[0029] In a second aspect, the present application provides an endoscope device, which includes an endoscope imaging system as described in any one of the first aspects.

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

[0031] In the embodiment of the present application, the endoscope imaging system includes a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element in sequence from the object side to the image side along the optical axis; the lens subsystem includes a first lens group with positive focal power, a second lens group with negative focal power, and a third lens group with positive focal power. Among them, the object side surface of the first lens from the object side to the image side 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 are all convex surfaces, so as to collect sufficient light and meet the brightness requirements of high imaging effects; the object side surface of the first lens from the object side to the image side in the second lens group along the optical axis is a concave surface, which can effectively diverge the light collected by the first lens group, thereby balancing the various aberrations generated by the first lens group collecting light and increasing the size of the imaging surface; the positive focal power of the third lens group can balance the various aberrations generated by the second lens group collecting light, and the endoscope imaging system designed in this way can reduce the incident angle of light of each lens group while achieving a larger imaging surface, thereby balancing and calibrating the various aberrations of the endoscope imaging system and improving the imaging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of an endoscopic imaging system provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of a first lens group provided in an embodiment of the present application;

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

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

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

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

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

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

[0040] Fig. 9 A schematic diagram of visible light imaging provided in an embodiment of the present application;

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

[0042] Fig.11 A distortion schematic diagram provided in an embodiment of the present application;

[0043] Fig.12 A schematic diagram of field curvature provided in an embodiment of the present application;

[0044] Fig.13 A schematic diagram of color difference provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Among them, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] Furthermore, in the description of the embodiments of the present application, unless otherwise specified, “and” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0047] Specifically, in the description of the present application, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application, and, unless otherwise specified, the "connection" and "connection" mentioned in the present application include direct and indirect connections (connections).

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] The following is a brief introduction to the design concept of the embodiment of the present application:

[0050] Endoscopic equipment is one of the important tools for humans to identify organ lesions. Its clinical application is becoming more and more popular and it is a widely used medical device. Among them, the endoscopic imaging system is an important part of the endoscopic equipment.

[0051] However, in the related art, the light incident angle of the endoscopic imaging system with a large imaging surface that requires large light deflection is large, which increases the various aberrations in the endoscopic imaging system and greatly affects the imaging effect of the endoscopic imaging system.

[0052] To solve the above problems, the endoscope imaging system in the embodiment of the present application includes a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element in sequence from the object side to the image side along the optical axis; the lens subsystem includes a first lens group with positive focal power, a second lens group with negative focal power, and a third lens group with positive focal power. Among them, the object side surface of the first lens from the object side to the image side 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 are all convex surfaces, so as to collect sufficient light and meet the brightness requirements of high imaging effects; the object side surface of the first lens from the object side to the image side in the second lens group along the optical axis is a concave surface, which can effectively diverge the light collected by the first lens group, thereby balancing the various aberrations generated by the first lens group collecting light and increasing the size of the imaging surface; the positive focal power of the third lens group can balance the various aberrations generated by the second lens group collecting light, and the endoscope imaging system designed in this way can reduce the incident angle of light of each lens group while achieving a larger imaging surface, thereby balancing and calibrating the various aberrations of the endoscope imaging system and improving the imaging effect.

[0053] An embodiment of the present application provides an endoscope imaging system, which includes, in order from the object side to the image side along the optical axis: a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element.

[0054] The first window glass and the second window glass are used to protect the lens in the lens subsystem; the detection imaging element is used to display the image formed by the lens subsystem.

[0055] In the embodiment of the present application, the lens subsystem includes, in sequence from the object side to the image side along the optical axis:

[0056] A first lens group with positive focal power, 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 object side surface of the first lens along the optical axis from the object side to the image side in the first sub-lens group is a convex surface, the second sub-lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the second sub-lens group is a convex surface, the third sub-lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the third sub-lens group is a convex surface. A second lens group with negative focal power, the second lens group is used to diverge light, the second lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the second lens group is a concave surface. A third lens group with positive focal power, the third lens group is used to focus light.

[0057] Figure 1A schematic diagram of an endoscopic imaging system provided in an embodiment of the present application. The endoscopic imaging system includes two major parts, the first part is an adapter lens, and the second part is a detection imaging element. The adapter lens includes a first window glass 01, an aperture 02, a lens subsystem 03, and a second window glass 04, and the detection imaging element 05 includes a filter 051 and a detection imaging surface 052. The detection imaging element 05 can convert an optical signal into an electrical signal to achieve image capture. The detection imaging element 05 can be a CMOS image sensor, or it can be a CCD image sensor. The specific implementation method of the detection imaging element can be selected according to different needs, and the present application does not impose any limitation on this.

[0058] The lens subsystem includes a first lens group 031 , a second lens group 032 and a third lens group 033 .

[0059] Optionally, in the embodiment of the present application, the aperture is a necessary part of the endoscope imaging system and is placed between the first window glass 01 and the lens subsystem 03 .

[0060] For example, Figure 2 , which is a schematic diagram of a first lens group provided in an embodiment of the present application. 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 embodiment of the present application, the first lens group includes the first sub-lens group, the second sub-lens group and the third sub-lens group from the object side to the image side. Among them, the object side surface of the first lens from the object side to the image side along the optical axis 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, so as to collect sufficient light and meet the brightness requirement of high imaging effect.

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

[0063] In an optional embodiment, if Figure 2 As shown, at least one lens included in the first sub-lens group is a first meniscus lens 0311.

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

[0065] In an optional embodiment, if Figure 2 As shown, the second sub-lens group includes a first biconvex lens 0312 and a first biconcave lens 0313 in sequence 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 glued together.

[0066] In another optional embodiment, if Figure 3 As shown, the second sub-lens group includes a first biconvex lens 0312, a meniscus lens and a first biconcave lens 0313 in sequence from the object side to the image side along the optical axis, and the first biconvex lens 0312, the meniscus lens and the first biconcave lens 0313 are glued together.

[0067] Optionally, the first lens from the object side to the image side along the optical axis in the third sub-lens group is a second biconvex lens, and the last lens is a second biconcave lens.

[0068] In an optional embodiment, if Figure 2 As shown, the third sub-lens group includes a second biconvex lens 0314 and a second biconcave lens 0315 in sequence from the object side to the image side along the optical axis, and the second biconvex lens 0314 and the second biconcave lens 0315 are glued together.

[0069] In another optional embodiment, if Figure 4 As shown, the third sub-lens group includes a second biconvex lens 0314, a meniscus lens and a second biconcave lens 0315 in sequence from the object side to the image side along the optical axis, and the second biconvex lens 0314, the meniscus lens and the second biconcave lens 0315 are glued together.

[0070] Optionally, the second lens group includes at least two lenses cemented together, 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 a concave surface.

[0071] In an optional embodiment, if Figure 5 As shown, the second lens group includes 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, and the third biconcave lens, the third biconvex lens, and the second meniscus lens are cemented together.

[0072] It should be noted that in the embodiment of the present application, the second lens group has a negative optical focal length, and 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 is a concave surface, which can effectively diverge the light collected by the first lens group, thereby balancing the various aberrations generated by the light collected by the first lens group and increasing the size of the imaging surface.

[0073] Optional, such as Figure 6 As shown, the third lens group includes a fourth biconvex lens 0331 and a fifth biconvex lens 0332 in sequence from the object side to the image side along the optical axis.

[0074] It should be noted that in the embodiment of the present application, the third lens group has positive optical focal length, which can balance the various aberrations generated by the second lens group collecting light, so that the incident angle of the 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 various 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 and is used for filtering the light beam.

[0076] based on Figure 1-Figure 6 The lens structure shown is a schematic diagram of an endoscope imaging system according to an embodiment of the present application. Figure 7 As shown, 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 an embodiment of the present application, the diameters of the lenses of the second lens group and the third lens group are both larger than the diameter 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 lens in the endoscope imaging system can be a spherical lens or an aspherical lens, and this application does not impose any limitation on this.

[0079] Optionally, the endoscopic imaging system of the embodiment of the present application meets the following conditions:

[0080] L1 / L≥0.7, and L2 / L1≤0.3;

[0081] Wherein, L1 represents the total thickness of each lens in the endoscopic imaging system, L2 represents the total thickness of air between each lens in the endoscopic imaging system, and L represents the sum of L1 and L2.

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

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

[0084] The first lens group meets the following conditions: 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 meets the following conditions: -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 meets the following conditions: 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 Figure 7 The endoscope imaging system shown in FIG. 1 is a schematic diagram of a visible light imaging embodiment of the present application. Fig. 9 As shown, after the visible light enters the endoscopic imaging system, it is refracted by the lens in the endoscopic imaging system, and finally the visible light is gathered on the imaging surface.

[0091] Among them, the white light imaging resolution MTF is as follows Fig.10 As shown, it is basically close to the diffraction limit, and at 200lp / mm, the average contrast reaches 0.2.

[0092] like Fig.11 FIG. 1 is a schematic diagram of a distortion in an embodiment of the present application, wherein the distortion is less than 1%, and the image deformation is not visible to the naked eye.

[0093] like Fig.12 FIG. 1 is a schematic diagram of a field curvature according to an embodiment of the present application, wherein the field curvature is less than 0.05, and the image deformation is not visible to the naked eye.

[0094] like Fig.13 As shown, a color difference diagram of an embodiment of the present application. Among them, the color difference of the present application is less than 1.5 microns, within the range of the Airy disk, and no additional color deviation will be generated.

[0095] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0096] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0097] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0099] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An endoscopic imaging system, characterized in that: The endoscope imaging system includes, from the object side to the image side along the optical axis, a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element in sequence; Wherein, the first window glass and the second window glass are used to protect the lens in the lens subsystem; The detection imaging element is used to display the image formed by the lens subsystem; The lens subsystem includes, in order from the object side to the image side along the optical axis: A first lens group with positive optical power, 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 object side surface of the first lens along the optical axis from the object side to the image side in the first sub-lens group is a convex surface, the second sub-lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the second sub-lens group is a convex surface, the third sub-lens group includes at least two lenses glued together, the object side surface of the first lens along the optical axis from the object side to the image side in the third sub-lens group is a convex surface; a second lens group with negative optical power, the second lens group being used to diverge light, the second lens group comprising at least two lenses cemented together, 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 a concave surface; A third lens group with positive optical power is used to focus the light.

2. The endoscopic imaging system according to claim 1, characterized in that: The first lens in the first sub-lens group along the optical axis from the object side to the image side is a first meniscus lens.

3. The endoscopic imaging system according to claim 1, characterized in that: The first lens of 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 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.

4. The endoscopic imaging system according to any one of claims 1 to 3, characterized in that: The second lens group includes 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 glued together.

5. The endoscopic imaging system according to claim 1, characterized in that: The third lens group includes a fourth biconvex lens and a fifth biconvex lens in sequence from the object side to the image side along the optical axis.

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

7. The endoscopic imaging system according to claim 1, characterized in that: The second lens group meets the following conditions: -0.4≤f2 / f≤-0.6; Among them, f2 is the focal length of the second lens group; f is the focal length of the endoscope imaging system.

8. 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; Among them, f3 is the focal length of the third lens group; f is the focal length of the endoscope imaging system.

9. The endoscopic imaging system according to claim 1, characterized in that: The endoscopic imaging system meets the following conditions: L1 / L≥0.7, and L2 / L1≤0.3; Wherein, L1 represents the total thickness of each lens in the endoscopic imaging system, L2 represents the total thickness of air between each lens in the endoscopic imaging system, and L represents the sum of L1 and L2.

10. An endoscope device, characterized in that: The endoscopic device comprises the endoscopic imaging system according to any one of claims 1-9.

Images