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 an optical axis, a first window glass, an aperture, a lens sub-system, a second window glass and a detection imaging element; the first window glass and the second window glass are used for protecting the lenses in the lens sub-system; the detection imaging element is used for displaying an image formed by the lens sub-system; the lens sub-system comprises, in sequence from the object side to the image side along the optical axis, a first lens group and a second lens group; the second lens group is fixedly arranged in an inner lens barrel, the inner lens barrel can move forward and backward in a fixed lens barrel, the first lens group is fixedly arranged in the fixed lens barrel and is located on the object side of the inner lens barrel; the first lens group comprises, in sequence from the object side to the image side along the optical axis, a first lens with positive refractive power, a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power and a third sub-lens group with negative refractive power; and the second lens group is a lens group with positive refractive power.

Description

TECHNICAL FIELD

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

[0002] The endoscope imaging system is a kind of commonly used medical instrument, and doctors can observe the ulcer or tumor in the patient's body by means of the endoscope imaging system, and accordingly make the best treatment plan.

[0003] However, the structure design of the endoscope imaging system in the prior art causes the need to adjust the entire optical system inside the adapter when matching different endoscopes to adjust the clarity of the imaging field of view, which limits the process of adjusting the clarity, resulting in relatively inconvenient adjustment actions. SUMMARY

[0004] The present application provides an endoscope imaging system and an endoscope device to solve the problem that the prior art needs to adjust the entire optical system inside the adapter when matching different endoscopes to adjust the clarity of the imaging field of view, which limits the process of adjusting the clarity, resulting in relatively difficult adjustment actions.

[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 the 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 and a second lens group; the second lens group is fixedly arranged in an inner lens barrel, and the inner lens barrel is movable forward and backward in a fixed lens barrel; the first lens group is fixedly arranged in the fixed lens barrel and located on the object side of the inner lens barrel.

[0009] The first lens group comprises, in order from the object side to the image side along the optical axis, a first lens with positive focal power, a first lens group with negative focal power, and a second lens group with positive focal power.

[0010] The first lens with positive focal power is used to focus light rays.

[0011] The first lens group with negative focal power comprises, in order from the object side to the image side along the optical axis, a first sub-lens group with negative focal power, and a second sub-lens group with positive focal power.

[0012] a second sub-lens group with positive optical power, an image-side surface of a last lens along an optical axis from an object side to an image side in the second sub-lens group being a convex surface, the second sub-lens group being configured to focus light rays;

[0013] a third sub-lens group with negative optical power, an image-side surface of a last lens along an optical axis from an object side to an image side in the third sub-lens group being a concave surface, the third sub-lens group being configured to diverge light rays;

[0014] the second lens group being a lens group with positive optical power, an image-side surface of a last lens along an optical axis from an object side to an image side in the second lens group being a concave surface, the second lens group being configured to focus light rays.

[0015] The lens sub-system in the endoscope imaging system provided by the embodiments of the present application has the following advantages or beneficial effects: the lens sub-system in the endoscope imaging system provided by the embodiments of the present application sequentially includes a first lens group and a second lens group along an optical axis from an object side to an image side; the second lens group is fixedly arranged in an inner lens barrel, and the inner lens barrel is movable forward and backward in a fixed lens barrel; the first lens group is fixedly arranged in the fixed lens barrel and located on the object side of the inner lens barrel. When the field angle of the endoscope imaging system is adjusted, i.e., the object-side working distance is adjusted, the inner lens barrel is moved along the optical axis, only the second lens group is moved, and the first lens group is not moved. When the image definition is adjusted, only one lens group needs to be moved, so that the image definition can be adjusted in the process of adjusting the imaging field of view when the endoscope system is connected to different endoscopes, and a clear image can be obtained, and only one lens group is moved, so that the adjustment operation is more convenient.

[0016] In a possible implementation, the first lens is a first meniscus lens with a concave object-side surface and a convex image-side surface along the optical axis from the object side to the image side.

[0017] The lens sub-system in the endoscope imaging system provided by the embodiments of the present application has the following advantages or beneficial effects: the lens sub-system in the endoscope imaging system provided by the embodiments of the present application sequentially includes a first lens group and a second lens group along an optical axis from an object side to an image side; the second lens group is fixedly arranged in an inner lens barrel, and the inner lens barrel is movable forward and backward in a fixed lens barrel; the first lens group is fixedly arranged in the fixed lens barrel and located on the object side of the inner lens barrel. When the field angle of the endoscope imaging system is adjusted, i.e., the object-side working distance is adjusted, the inner lens barrel is moved along the optical axis, only the second lens group is moved, and the first lens group is not moved. When the image definition is adjusted, only one lens group needs to be moved, so that the image definition can be adjusted in the process of adjusting the imaging field of view when the endoscope system is connected to different endoscopes, and a clear image can be obtained, and only one lens group is moved, so that the adjustment operation is more convenient.

[0018] In a possible implementation, the first sub-lens group sequentially includes a first cemented lens and a second cemented lens along the optical axis from the object side to the image side.

[0019] The first cemented lens sequentially includes a first double convex lens and a first double concave lens along the optical axis from the object side to the image side, and the first double convex lens and the first double concave lens are cemented together.

[0020] The second cemented lens comprises a second biconcave lens and a second biconvex lens in sequence from the object side to the image side along the optical axis, and the second biconcave lens and the second biconvex lens are cemented together.

[0021] The technical scheme has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged in the endoscope imaging system, the imaging range is larger, large target surface imaging is realized, and 1 / 1.2' CMOS size is maximally supported on the basis that the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent path can be clearly imaged.

[0022] In a possible implementation, the second sub-lens group comprises a third biconvex lens, a third biconcave lens and a fourth biconvex lens in sequence from the object side to the image side along the optical axis, and the third biconvex lens, the third biconcave lens and the fourth biconvex lens are cemented together.

[0023] The third sub-lens group comprises a second meniscus lens and a third meniscus lens in sequence from the object side to the image side along the optical axis; the second meniscus lens and the third meniscus lens are cemented together; the object side surface of the second meniscus lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third meniscus lens is a convex surface, and the image side surface is a concave surface.

[0024] The technical scheme has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged in the endoscope imaging system, the imaging range is larger, large target surface imaging is realized, and 1 / 1.2' CMOS size is maximally supported on the basis that the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent path can be clearly imaged.

[0025] In a possible implementation, the second lens group comprises a fifth biconvex lens and a fourth biconcave lens in sequence from the object side to the image side along the optical axis; the fifth biconvex lens and the fourth biconcave lens are cemented together.

[0026] The technical scheme has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged in the endoscope imaging system, the imaging range is larger, large target surface imaging is realized, and 1 / 1.2' CMOS size is maximally supported on the basis that the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent path can be clearly imaged.

[0027] In a possible implementation, the second lens group satisfies the following condition:

[0028] H≤13mm:

[0029] H is a moving distance of the second lens group between the third sub-lens group and the second window glass, used for adjusting a field of view angle of the endoscope imaging system.

[0030] The technical solution has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged in the endoscope imaging system, the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent light path can be clearly imaged, the adjusting range is increased, the case of unclear imaging of the endoscope system is reduced, and the doctor is facilitated to adjust and use.

[0031] In a possible implementation, the endoscope imaging system satisfies the following conditions:

[0032] 1.8≤f1 / f≤2.2, and 1.2≤f2 / f≤1.7

[0033] f1 is the focal length of the first lens group; f2 is the focal length of the second lens group; and f is the focal length of the endoscope imaging system.

[0034] The technical solution has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged in the endoscope imaging system, the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent light path can be clearly imaged.

[0035] In a possible implementation, the endoscope imaging system satisfies the following conditions:

[0036] L1 / L≤0.4, and L2 / L1≤0.28

[0037] L1 represents the total thickness of each lens in the endoscope imaging system; L2 represents the total air thickness between each lens in the endoscope imaging system, and L represents the total length of the endoscope imaging system.

[0038] The technical solution has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged in the endoscope imaging system, the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent light path can be clearly imaged, the air spacing thickness in the endoscope imaging system is limited, the spacing between lenses is small, and thus the optical system is more compact, facilitating the doctor to adjust and use.

[0039] In a possible implementation, the detection imaging element includes a light splitting prism and at least two imaging surfaces.

[0040] The detection imaging element is configured to, if the endoscope imaging system is used for visible light imaging and fluorescence imaging, split the received light into visible light and infrared light through the light splitting prism, and form images on different imaging surfaces based on the visible light and the infrared light, respectively.

[0041] The technical scheme has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged, and it is ensured that the white light image corresponding to the white light path and the fluorescence image corresponding to the fluorescence path can be clearly imaged.

[0042] In a possible implementation, when the endoscope imaging system is used for visible light imaging, the adapter object distance range corresponding to the endoscope imaging system is not less than 110 mm; when the endoscope imaging system is used for fluorescence imaging, the adapter object distance range corresponding to the endoscope imaging system is not less than 110 mm.

[0043] The technical scheme has the following advantages or beneficial effects: in order to make the process of adjusting the image definition more convenient, the lens structure is arranged, and it is ensured that the white light image corresponding to the white light path and the fluorescence image corresponding to the fluorescence path can be clearly imaged.

[0044] 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. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 FIG. 1 is a structural schematic diagram of an endoscope device according to an embodiment of the present application;

[0046] Figure 2 FIG. 2 is a diagram of an adjusting range in the related art;

[0047] Figure 3 FIG. 3 is a schematic diagram of an endoscope imaging system according to an embodiment of the present application;

[0048] Figure 4 FIG. 4 is a schematic diagram of a first lens according to an embodiment of the present application;

[0049] Figure 5 FIG. 5 is a schematic diagram of a first sub-lens group according to an embodiment of the present application;

[0050] Figure 6 FIG. 6 is a schematic diagram of a second sub-lens group according to an embodiment of the present application;

[0051] Figure 7 FIG. 7 is a schematic diagram of a third sub-lens group according to an embodiment of the present application;

[0052] Figure 8A schematic diagram of a second lens group according to an embodiment of the present application;

[0053] Figure 9 A schematic diagram of an endoscope imaging system according to an embodiment of the present application;

[0054] Figure 10 A schematic diagram of an adjustment range according to an embodiment of the present application;

[0055] Figure 11 A schematic diagram of an application scenario according to an embodiment of the present application;

[0056] Figure 12 A schematic diagram of visible light imaging according to an embodiment of the present application;

[0057] Figure 13 A schematic diagram of visible light imaging and infrared light imaging according to an embodiment of the present application;

[0058] Figure 14 A schematic diagram of white light imaging resolution when the object distance is 110 mm according to an embodiment of the present application;

[0059] Figure 15 A schematic diagram of fluorescent imaging resolution when the object distance is 110 mm according to an embodiment of the present application;

[0060] Figure 16 A schematic diagram of white light imaging resolution when the object distance is a nominal working distance according to an embodiment of the present application;

[0061] Figure 17 A schematic diagram of fluorescent imaging resolution when the object distance is a nominal working distance according to an embodiment of the present application;

[0062] Figure 18 A schematic diagram of distortion of a white light image according to an embodiment of the present application;

[0063] Figure 19 A schematic diagram of distortion of a fluorescent image according to an embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to make the objects, 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 but not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0065] And, 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; "and / or" in the text only describes the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone.

[0066] Specifically, in the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application, and the present application "connected", "coupled", if not specifically stated, includes direct and indirect connections (couplings).

[0067] 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.

[0068] In the following, some terms in the embodiments of the present application are explained and described to facilitate understanding by those skilled in the art.

[0069] The design idea of the embodiments of the present application is briefly introduced as follows:

[0070] The endoscope imaging system is a relatively common medical instrument. The doctor can observe the ulcer or tumor in the patient's body with the help of the endoscope imaging system, and accordingly make the best treatment plan.

[0071] However, the structure design of the endoscope imaging system in the prior art causes the need to adjust the entire optical system inside the adapter when adjusting the imaging field clarity of the endoscope imaging system when matching different endoscopes, which limits the process of adjusting the clarity, resulting in relatively difficult adjustment action.

[0072] To solve the above problems, the embodiment of the present application sets the first lens group and the second lens group in the lens subsystem of the endoscope imaging system in sequence from the object side to the image side along the optical axis; the second lens group is fixedly arranged in the inner lens barrel, and the inner lens barrel is movable forward and backward in the fixed barrel; the first lens group is fixedly arranged in the fixed barrel and located on the object side of the inner lens barrel. When adjusting the field angle of the endoscope imaging system, i.e., adjusting the object side working distance, moving the inner lens barrel along the optical axis will only move the second lens group and will not move the first lens group. When adjusting the image definition, only one lens group needs to be moved, so that the image definition can be adjusted in the process of adjusting the imaging field of view when the endoscope system is connected with different endoscopes, and a clear image can be obtained, and moving only one lens group will be more convenient than adjusting the entire optical system in the adapter.

[0073] After introducing the design idea of the embodiment of the present application, the application scenarios provided by the present application are briefly described below. It should be noted that the following scenarios are only used to illustrate the embodiments of the present application and are not limiting. In the specific implementation, the technical solutions provided by the embodiments of the present application can be flexibly applied according to actual needs.

[0074] Figure 1 An exemplary structure diagram of an endoscope device in the embodiment of the present application is shown, wherein the endoscope device includes a cold light source, a camera assembly, and a display.

[0075] The camera assembly can be used to take pictures of endoscopic examination and surgery to collect picture data of the examination and surgery; the key components thereof can include one or more of a camera, a key, a camera host, a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor, a video line, an optical adapter, an objective field of view, a mirror rod, a communication port, and a video output interface. The camera host can be connected with the display through the video output interface and connected with the cold light source host through the communication port.

[0076] In the embodiment of the present application, the objective field of view, the mirror rod, the optical adapter, the key, the CMOS, and the camera in the key components of the camera assembly can also be collectively referred to as an endoscope camera.

[0077] The display can be used to display the endoscope image collected and generated by the camera assembly.

[0078] The cold light source can be used to provide illumination light for the endoscope in endoscopic examination and surgery; the key components thereof usually include a cold light source host, a light guide beam, a communication port, and a cold light source light output interface.

[0079] It should be understood that, Figure 1The schematic diagram of the endoscopic device shown is merely an example, and the endoscopic device can have more than... Figure 1 The more or fewer components shown can be combined into two or more components, or they can have different component configurations. The various components shown in the figure can be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application-specific integrated circuits.

[0080] During implementation, when using the endoscope, the operator holds the handle of the endoscope, points the tip of the endoscope rod toward the area to be examined, and maintains a certain distance. After each change of distance, the operator adjusts the lens by manually rotating the adapter knob to obtain a clear image.

[0081] In the process of adjusting the field of view of the endoscopic imaging system, that is, adjusting the working distance of the object side, the image sharpness can be adjusted by moving the optical structure of the spherical lens group with optical power in the endoscope tube back and forth along the optical axis, thereby obtaining a clear image.

[0082] The structural design of the endoscopic imaging system in related technologies allows for the adjustment of the imaging field of view's clarity by rotating the adapter lens knob. This enables the aperture and lens subsystem within the endoscopic imaging system to be moved back and forth, thereby adjusting the field of view, i.e., the object-side working distance, to obtain a clearer image. For example... Figure 2 As shown, L1 represents the gap distance between the aperture stop and the first window glass, characterizing the forward adjustment length of the endoscopic imaging system; L2 represents the gap distance between the image side of the last lens of the lens subsystem and the second window glass, characterizing the backward adjustment length of the endoscopic imaging system; L = L1 + L2, where L represents the total adjustment length of the endoscopic imaging system. L1 and L2 are used to adjust the field of view of the endoscopic imaging system, that is, to adjust the object-side working distance. The larger the value of L1 + L2, the larger the adjustable range.

[0083] Therefore, adjusting the entire optical system inside the adapter is required, which limits the process of adjusting sharpness and makes the adjustment action more difficult.

[0084] To address the aforementioned issues, this application provides an endoscopic imaging system, which includes, in sequence along the optical axis from the object side to the image side: a first window glass, an aperture, a lens subsystem, a second window glass, and a detection imaging element.

[0085] The first and 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.

[0086] The lens subsystem in the embodiment of the present application comprises, along the optical axis from the object side to the image side, in sequence: a first lens group and a second lens group; the second lens group is fixedly arranged in an inner lens barrel, and the inner lens barrel is movable in a fixed lens barrel, the first lens group is fixedly arranged in the fixed lens barrel, and is located on the object side of the inner lens barrel.

[0087] The first lens group comprises, along the optical axis from the object side to the image side, in sequence: a first lens with positive focal power, which is used for focusing light; a first sub-lens group with negative focal power, the image side surface of the last lens along the optical axis from the object side to the image side in the first sub-lens group is a convex surface, and the first sub-lens group is used for diverging light; a second sub-lens group with positive focal power, the image side surface of the last lens along the optical axis from the object side to the image side in the second sub-lens group is a convex surface, and the second sub-lens group is used for focusing light; and a third sub-lens group with negative focal power, the image side surface of the last lens along the optical axis from the object side to the image side in the third sub-lens group is a concave surface, and the third sub-lens group is used for diverging light.

[0088] The second lens group is a lens group with positive focal power, the image side surface of the last lens along the optical axis from the object side to the image side in the second lens group is a concave surface, and the second lens group is used for focusing light.

[0089] When the field angle of the endoscope imaging system is adjusted, i.e., the object side working distance is adjusted, the inner lens barrel is moved along the optical axis.

[0090] As shown in FIG. 1, Figure 3 As shown in FIG. 1,

[0091] The detection imaging element in the embodiment of the present application can realize the light splitting function, the filtering function of the optical system, and thus can realize the light splitting function in the visible light band and the near-infrared band.

[0092] The lens subsystem comprises a first lens group 031 and a second lens group 032; the second lens group 032 is fixedly arranged in an inner lens barrel, and the inner lens barrel is movable in a fixed lens barrel, the first lens group 031 is fixedly arranged in the fixed lens barrel, and is located on the object side of the inner lens barrel.

[0093] The first lens group 031 comprises a first lens 0311, a first sub-lens group 0312, a second sub-lens group 0313 and a third sub-lens group 034.

[0094] Optionally, the diaphragm is a necessary part of the endoscope imaging system in the embodiment of the application, which is arranged at the front end of the endoscope imaging system, and the diameter of the diaphragm is not greater than 7 mm.

[0095] Optionally, the first lens 0311 in the embodiment of the application is a first meniscus lens, the object side surface of which is concave from the object side to the image side along the optical axis, and the image side surface of which is convex.

[0096] For example, as shown in the schematic diagram of a first lens in the embodiment of the application, the left side of the first lens 0311 is the object side, and the right side is the image side. The object side surface of the first meniscus lens is concave, and the image side surface is convex. Figure 4

[0097] Optionally, the first sub-lens group in the embodiment of the application sequentially includes a first cemented lens and a second cemented lens from the object side to the image side along the optical axis.

[0098] For example, as shown in the schematic diagram of a first sub-lens group in the embodiment of the application, the left side of the first sub-lens group 0312 is the object side, and the right side is the image side. The object side surface of the first sub-lens group 0312 is convex, and the image side surface is convex. The first cemented lens sequentially includes a first double convex lens 03121 and a first double concave lens 03122 from the object side to the image side along the optical axis, and the first double convex lens 03121 and the first double concave lens 03122 are cemented together. The object side surface of the first cemented lens is convex, and the image side surface is concave. The second cemented lens sequentially includes a second double concave lens 03123 and a second double convex lens 03124 from the object side to the image side along the optical axis, and the second double concave lens 03123 and the second double convex lens 03124 are cemented together. The object side surface of the second cemented lens is concave, and the image side surface is convex. Figure 5

[0099] Optionally, the second sub-lens group in the embodiment of the application sequentially includes a third double convex lens, a third double concave lens and a fourth double convex lens from the object side to the image side along the optical axis, and the third double convex lens, the third double concave lens and the fourth double convex lens are cemented together.

[0100] For example, as shown in the schematic diagram of a second sub-lens group in the embodiment of the application, the left side of the second sub-lens group 0313 is the object side, and the right side is the image side. As shown in the schematic diagram of a second sub-lens group in the embodiment of the application, 03131 represents the third double convex lens, 03132 represents the third double concave lens, and 03133 represents the fourth double convex lens. The object side surface of the second sub-lens group is convex, and the image side surface is convex. Figure 6 Figure 6

[0101] Optionally, the third sub-lens group in the embodiment of the application sequentially includes a second meniscus lens and a third meniscus lens from the object side to the image side along the optical axis, and the second meniscus lens and the third meniscus lens are cemented together.​​​​

[0102] For example, such as Figure 7 The diagram shown is a schematic representation of a third sub-lens group according to an embodiment of this application. The left side of the third sub-lens group 0314 is the object side, and the right side is the image side. Figure 7 In the diagram, 03141 represents the second meniscus lens, and 03142 represents the third meniscus lens. The object-side surface of the second meniscus lens 03141 is convex, and the image-side surface is concave; the object-side surface of the third meniscus lens 03142 is convex, and the image-side surface is concave. The object-side surface of the third sub-lens group 0314 is convex, and the image-side surface is concave.

[0103] Optionally, in the embodiments of this application, the second lens group includes a fifth biconvex lens and a fourth biconcave lens sequentially along the optical axis from the object side to the image side; the fifth biconvex lens and the fourth biconcave lens are cemented together.

[0104] For example, such as Figure 8 The diagram shown is a schematic representation of a second lens group according to an embodiment of this application. The left side of the second lens group 032 is the object side, and the right side is the image side. Figure 8 In the diagram, 0321 represents the fifth biconvex lens and 0322 represents the fourth biconcave lens. The object-side surface of the second lens group 032 is convex, and the image-side surface is concave.

[0105] It should be noted that in the embodiments of this application, the first lens, the first sub-lens group (first cemented lens and second cemented lens), the second sub-lens group, the third sub-lens group and the second lens group are all lenses with optical power.

[0106] The first lens, the second sub-lens group, and the second lens group all have positive optical power and can effectively converge light at the light incident end and the light exit end, respectively. While ensuring the field of view, they can better compress the length of the entire system.

[0107] The first sub-lens group (first cemented lens and second cemented lens) and the third sub-lens group both have negative optical power, which diverges the light beam and prevents the light from deflecting too much at each group, effectively balancing the aberrations of the calibration system.

[0108] based on Figures 3-8 The lens structure shown is a schematic diagram of an endoscopic imaging system according to an embodiment of this application. Figure 9 As shown. Among them, except for the first lens 0311, the first sub-lens group 0312 (first cemented lens and second cemented lens), the second sub-lens group 0312, the third sub-lens group 0314 and the second lens group 032, the optical focal length of the remaining lenses is 0.

[0109] Optionally, the embodiments of this application do not limit the diameter of the lenses in the lens subsystem.

[0110] It should be noted that the lens in the endoscope imaging system can be a spherical lens or an aspherical lens, and the present application does not limit this.

[0111] Based on the endoscope imaging system as shown in Figure 9 The present application adjusts the field of view angle of the endoscope imaging system, that is, adjusts the object side working distance, and then moves the second lens group 032 in the inner lens barrel along the optical axis without moving the first lens group 031, so as to adjust the image clarity.

[0112] As shown in Figure 10 The present application provides a schematic diagram of the adjustment range. Wherein, H1 represents the gap distance between the image side of the third sub-lens group and the object side of the second lens group, representing the forward adjustment length of the endoscope imaging system; H2 represents the gap distance between the image side of the second lens group and the second window glass, representing the backward adjustment length of the endoscope imaging system; H=H1+H2, H represents the total adjustment length of the endoscope imaging system. H1 and H2 are used to adjust the field of view angle of the endoscope imaging system, that is, to adjust the object side working distance.

[0113] It should be noted that the greater the value of H1+H2, the greater the adjustable range.

[0114] Optionally, the forward and backward adjustment lengths of the embodiment of the present application satisfy the following conditions:

[0115] H≤13mm, that is, H1+H2≤13mm;

[0116] Wherein, H is the moving distance of the second lens group between the third sub-lens group and the second window glass, and H is used to adjust the field of view angle of the endoscope imaging system, that is, to adjust the object side working distance.

[0117] Therefore, after changing the working distance each time during the use of the endoscope, the present application can change the sizes of the gap H1 and the gap H2, increase the adjustment range of the handle lens, and reduce the probability of unclear field of view imaging when using the endoscope, thereby facilitating the adjustment and use of the operator.

[0118] Optionally, the focal length of the endoscope imaging system of the embodiment of the present application satisfies the following conditions:

[0119] 1.8≤f1 / f≤2.2, and 1.2≤f2 / f≤1.7;

[0120] Wherein, f1 is the focal length of the first lens group; f2 is the focal length of the second lens group; f is the focal length of the endoscope imaging system.

[0121] In order to make the process of adjusting the image definition more convenient, the focal length of the endoscope imaging system satisfies the above conditions, and it is ensured that the white light image corresponding to the white light path and the fluorescent image corresponding to the fluorescent light path can be clearly imaged.

[0122] Optionally, the endoscope imaging system of the embodiment of the present application satisfies the following conditions:

[0123] L1 / L≤0.4, and L2 / L1≤0.28;

[0124] Wherein, L1 represents the total thickness of each lens in the endoscope imaging system; L2 represents the total air thickness between each lens in the endoscope imaging system, and L represents the total length of the endoscope imaging system.

[0125] In the embodiment of the present application, L1 can represent the total thickness of the non-flat lens (i.e. the curvature of the lens is not all 0), and the condition of L1 / L≤0.4 limits the total thickness of the lens. L2 can represent the total air thickness between the non-flat lenses (including the moving distance H of the second lens group between the third sub-lens group and the second window glass), and the condition of L2 / L1≤0.28 limits the air gap thickness, so that the lens gap is small. The whole optical system is relatively compact, so as to ensure that the endoscope imaging system is more compact, and also reduce the absorption of short-wave light energy by the lens material.

[0126] It should be noted that when the endoscope device does not include a mirror rod part, the single handle and adapter lens can also be clearly imaged. The application scenario of this case is shown in Figure 11 .

[0127] Wherein, the adapter object distance is the distance between the first window glass 01 in the endoscope imaging system and the surface of the detection part (such as the object surface shown in Figure 11 ).

[0128] Based on the endoscope imaging system as shown in Figure 9 , the embodiment of the present application is applicable to visible light imaging, such as Figure 12 , a schematic diagram of visible light imaging according to an embodiment of the present application. After the visible light enters the endoscope imaging system, it is refracted by the lenses in the endoscope imaging system, and finally the received light is split by the light splitting prism, and the visible light is gathered on the imaging surface corresponding to the visible light.

[0129] Based on the endoscope imaging system as shown in Figure 9 , the embodiment of the present application is also applicable to visible light imaging and fluorescent imaging. As shown in Figure 13As shown in the figure, the embodiment of the present application is a schematic diagram of visible light imaging and infrared light imaging. After the visible light and infrared light enter the endoscope imaging system, they are refracted by the lens in the endoscope imaging system, and finally the light received is split by the light splitting prism to obtain visible light and infrared light, and imaging is performed on different imaging surfaces based on the visible light and infrared light, respectively.

[0130] Optionally, when the endoscope imaging system is used for visible light imaging, the corresponding adapter object distance range of the endoscope imaging system is not less than 110 mm; when the endoscope imaging system is used for fluorescence imaging, the corresponding adapter object distance range of the endoscope imaging system is not less than 110 mm.

[0131] When the corresponding adapter object distance of the endoscope imaging system is at a distance of 110 mm, the white light imaging resolution MTF is as shown in the figure. Figure 14 When the corresponding adapter object distance of the endoscope imaging system is at a distance of 120 mm, the fluorescence imaging resolution MTF is as shown in the figure. Figure 15 It is basically close to the diffraction limit, and the imaging quality will not be greatly affected during the movement adjustment process, and is basically stable, that is, the resolution is also basically stable during the adjustment process after being connected to different endoscope rods.

[0132] It should be noted that the endoscope imaging system of the embodiment of the present application can accommodate a wide spectrum for wide spectrum imaging.

[0133] When the corresponding adapter object distance of the endoscope imaging system is at a distance of 110 mm, the white light imaging resolution MTF is as shown in the figure. Figure 16 When the corresponding adapter object distance of the endoscope imaging system is at a distance of 120 mm, the fluorescence imaging resolution MTF is as shown in the figure. Figure 17 It is basically close to the diffraction limit, and the imaging quality will not be greatly affected during the movement adjustment process, and is basically stable, that is, the resolution is also basically stable during the adjustment process after being connected to different endoscope rods.

[0134] The distortion schematic diagram of the white light image corresponding to the endoscope imaging system provided by the embodiment of the present application is as shown in the figure, and the distortion schematic diagram of the fluorescence image is as shown in the figure. Figure 18 Figure 19 The distortion is less than 0.2%, and there is basically no distortion, and the imaging quality is basically stable.

[0135] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0136] ​The 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 block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or blocks of the flowcharts. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or blocks of the flowcharts.

[0137] 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 block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or blocks of the flowcharts. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or blocks of the flowcharts.

[0138] 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 block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or blocks of the flowcharts. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or blocks of the flowcharts.

[0139] 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 from the object side to the image side along the optical axis. 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 and a second lens group along the optical axis from the object side to the image side; the second lens group is fixedly installed inside the inner endoscope tube, and the inner endoscope tube can move back and forth inside the fixed endoscope tube; the first lens group is fixedly installed inside the fixed endoscope tube and is located on the object side of the inner endoscope tube. The first lens group, along the optical axis from the object side to the image side, consists of a first lens with positive optical power, a first sub-lens group with negative optical power, a second sub-lens group with positive optical power, and a third sub-lens group with negative optical power. The first lens is used to focus light rays. The image side of the last lens in the first sub-lens group, along the optical axis from the object side to the image side, is convex. The first sub-lens group, along the optical axis from the object side to the image side, consists of a first cemented lens and a second cemented lens. The first cemented lens, along the optical axis from the object side to the image side, consists of a first biconvex lens and a first biconcave lens, and the first biconvex lens and the first biconcave lens are cemented together. The second cemented lens, along the optical axis from the object side to the image side, consists of a second biconcave lens and a second biconvex lens, and the second biconcave lens and the second biconcave lens are cemented together. The first sub-lens group is used to diverge light rays; the image-side surface of the last lens in the second sub-lens group along the optical axis from the object side to the image side is convex; the second sub-lens group consists of a third biconvex lens, a third biconcave lens, and a fourth biconvex lens in sequence along the optical axis from the object side to the image side, and the third biconvex lens, the third biconcave lens, and the fourth biconvex lens are cemented together; the third sub-lens group consists of a second meniscus lens and a third meniscus lens in sequence along the optical axis from the object side to the image side, and the second meniscus lens and the third meniscus lens are cemented together; the second sub-lens group is used to focus light rays; the image-side surface of the last lens in the third sub-lens group along the optical axis from the object side to the image side is concave; the third sub-lens group is used to diverge light rays; The second lens group is a lens group with positive optical power. The image side of the last lens in the second lens group from the object side to the image side along the optical axis is concave. The second lens group is composed of a fifth biconvex lens and a fourth biconcave lens in sequence from the object side to the image side along the optical axis. The fifth biconvex lens and the fourth biconcave lens are cemented together. The second lens group is used to focus light.

2. The endoscopic imaging system according to claim 1, characterized in that, The first lens is a meniscus lens in which the object side is concave and the image side is convex along the optical axis from the object side to the image side.

3. The endoscopic imaging system according to claim 1, characterized in that, The object-side surface of the second meniscus lens is convex, and the image-side surface is concave; the object-side surface of the third meniscus lens is convex, and the image-side surface is concave.

4. The endoscopic imaging system according to any one of claims 1-3, characterized in that, The second lens group satisfies the following conditions: H≤13mm Wherein, H is the moving distance of the second lens group between the third sub-lens group and the second window glass, used to adjust the field of view of the endoscopic imaging system.

5. The endoscopic imaging system according to any one of claims 1-3, characterized in that, The endoscopic imaging system meets the following conditions: 1.8 ≤ f1 / f ≤ 2.2, and 1.2 ≤ f2 / f ≤ 1.7 Where f1 is the focal length of the first lens group; f2 is the focal length of the second lens group; and f is the focal length of the endoscopic imaging system.

6. The endoscopic imaging system according to any one of claims 1-3, characterized in that, The endoscopic imaging system meets the following conditions: L1 / L≤0.4, and L2 / L1≤0.28 Wherein, 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 total length of the endoscopic imaging system.

7. The endoscopic imaging system according to claim 1, characterized in that, When the endoscopic imaging system is used for visible light imaging, the adapter object distance range corresponding to the endoscopic imaging system is not less than 110 mm; when the endoscopic imaging system is used for fluorescence imaging, the adapter object distance range corresponding to the endoscopic imaging system is not less than 110 mm.

8. An endoscopic device, characterized in that, The endoscopic device includes the endoscopic imaging system as described in any one of claims 1-7.

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