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 first window glass and the second window glass are used for protecting lenses in the lens subsystem; the detection imaging element is used for displaying an image formed by the lens subsystem; the lens subsystem sequentially comprises a first lens group and a second lens group from the object side to the image side along the optical axis; the second lens group is fixedly arranged in the inner lens cone, the inner lens cone can move back and forth in the fixed lens cone, and the first lens group is fixedly arranged in the fixed lens cone and located on the object side of the inner lens cone; the first lens group sequentially comprises a first lens with positive focal power, a first sub-lens group with negative focal power, a second sub-lens group with positive focal power and a third sub-lens group with negative focal power from the object side to the image side along the optical axis; the second lens group is a lens group with positive focal power.

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] Endoscopic imaging system is a commonly used medical device. Doctors can use the endoscopic imaging system to observe ulcers or tumors in the patient's body and develop the best treatment plan accordingly.

[0003] However, the structural design of the endoscopic imaging system in the prior art requires adjustment of the entire optical system inside the adapter when adjusting the clarity of the imaging field of view of the endoscopic imaging system when matching different endoscopes, which limits the process of adjusting the clarity and makes the adjustment action inconvenient. Summary of the invention

[0004] The present invention provides an endoscopic imaging system and an endoscopic device, which are used to solve the problem in the prior art that when the endoscopic imaging system adjusts the clarity of the imaging field when matching different endoscopes, it is necessary to adjust the entire optical system inside the adapter, which will limit the process of adjusting the clarity and make the adjustment action more difficult.

[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 a first lens group and a second lens group in sequence from the object side to the image side along the optical axis; the second lens group is fixedly arranged in an inner lens barrel, and the inner lens barrel can move forward and backward in the fixed lens barrel, and the first lens group is fixedly arranged in the fixed lens barrel and is on the object side of the inner lens barrel;

[0009] The first lens group includes, from the object side to the image side along the optical axis, the following:

[0010] A first lens with positive optical power, wherein the first lens is used to focus light;

[0011] a first sub-lens group with negative optical power, wherein the image side surface of the last lens in the first sub-lens group along the optical axis from the object side to the image side is a convex surface; the first sub-lens group is used to diverge light;

[0012] a second sub-lens group with positive optical power, wherein 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 a convex surface; the second sub-lens group is used to focus light;

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

[0014] The second lens group is a lens group with positive optical power, and the image side surface of the last lens in the second lens group from the object side to the image side along the optical axis is a concave surface; the second lens group is used to focus light.

[0015] The above technical solution has the following advantages or beneficial effects: the lens subsystem in the endoscope imaging system provided in the embodiment of the present application includes a first lens group and a second lens group 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 can move back and forth in the fixed lens barrel, and the first lens group is fixedly arranged in the fixed lens barrel and on the object side of the inner lens barrel. When adjusting the field of view angle of the endoscope imaging system, that is, adjusting the object side working distance, when moving the inner lens barrel along the optical axis, only the second lens group will be moved, and the first lens group will not be moved. When adjusting the image clarity, only one lens group needs to be moved to ensure that when the endoscope system is connected to different endoscopes, the image clarity can be adjusted during the process of adjusting the imaging field of view range, so as to ensure that a clear image is obtained. At the same time, compared with adjusting the entire optical system inside the adapter, only one lens group is moved, and the adjustment action will be lighter.

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

[0017] The above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application adds a first meniscus lens with a concave object side and a convex image side in the first lens group as the first lens with positive optical power, thereby focusing the light so that the image corresponding to the optical path can be clearly imaged.

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

[0019] The first cemented lens includes a first biconvex lens and a first biconcave lens in sequence from the object side to the image side along the optical axis, and the first biconvex lens and the first biconcave lens are cemented together;

[0020] The second cemented lens includes 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 above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application sets the above lens structure in the endoscope imaging system. On the basis of ensuring 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, the imaging range is expanded, large target surface imaging is achieved, and a maximum 1 / 1.2' CMOS size is supported.

[0022] In a possible implementation, the second sub-lens group includes 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 glued together;

[0023] The third sub-lens group includes 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 glued together; 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.

[0024] The above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application sets the above lens structure in the endoscope imaging system. On the basis of ensuring 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, the imaging range is expanded, large target surface imaging is achieved, and a maximum 1 / 1.2' CMOS size is supported.

[0025] In a possible implementation, the second lens group includes 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 above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application focuses the light by setting the second lens group of the above lens structure in the endoscope imaging system. While ensuring 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 and the image clarity adjustment process is easier, the imaging range is expanded and large target surface imaging is achieved.

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

[0028] H≤13mm:

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

[0030] The above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application arranges the above lens structure in the endoscopic imaging system. On the basis of ensuring 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, the adjustment range is increased, so that the situation of unclear imaging of the endoscopic system is reduced, which is convenient for doctors to adjust and use.

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

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

[0033] Among them, 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 above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application sets the above lens structure in the endoscope imaging system to ensure 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.

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

[0036] L1 / L≤0.4, and L2 / L1≤0.28

[0037] 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 total length of the endoscopic imaging system.

[0038] The above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application sets the above lens structure to limit the thickness of the air gap in the endoscopic imaging system while ensuring 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. The gap between the lenses is smaller, thereby ensuring that the optical system is shorter and more convenient for doctors to adjust and use.

[0039] In a possible implementation, the detection imaging element includes a beam splitter prism and at least two imaging surfaces;

[0040] The detection imaging element is used for splitting the received light through the beam splitter prism to obtain visible light and infrared light if the endoscope imaging system is used for visible light imaging and fluorescence imaging, and imaging is performed on different imaging planes based on the visible light and the infrared light.

[0041] The above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application sets the above lens structure to ensure 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.

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

[0043] The above technical solution has the following advantages or beneficial effects: In order to make the process of adjusting the image clarity easier, the embodiment of the present application increases the object distance range of the imaging by setting the above lens structure while ensuring 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.

[0044] 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0046] Figure 2 It is a schematic diagram of the adjustment range in the related art;

[0047] Figure 3 A schematic diagram of an endoscopic imaging system according to an embodiment of the present application;

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

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

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

[0051] Figure 7 This 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] Fig. 9 A schematic diagram of an endoscopic imaging system according to an embodiment of the present application;

[0054] Fig.10 A schematic diagram of an adjustment range of an embodiment of the present application;

[0055] Fig.11 A schematic diagram of an application scenario of an embodiment of the present application;

[0056] Fig.12 This is a schematic diagram of visible light imaging according to an embodiment of the present application;

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

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

[0059] Fig.15 This is a schematic diagram of fluorescence imaging resolution when the object distance is 110 mm according to an embodiment of the present application;

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

[0061] Fig.17 This is a schematic diagram of fluorescence imaging resolution when the object distance is the nominal working distance according to an embodiment of the present application;

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

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

[0064] 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.

[0065] 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.

[0066] 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).

[0067] 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.

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

[0069] The following is a brief introduction to the design concept of the embodiment of the present application:

[0070] Endoscopic imaging system is a commonly used medical device. Doctors can use the endoscopic imaging system to observe ulcers or tumors in the patient's body and develop the best treatment plan accordingly.

[0071] However, the structural design of the endoscopic imaging system in the prior art requires adjustment of the entire optical system inside the adapter when adjusting the clarity of the imaging field of view of the endoscopic imaging system when matching different endoscopes, which limits the process of adjusting the clarity and makes the adjustment action more difficult.

[0072] In order to solve the above problems, the embodiment of the present application arranges the first lens group and the second lens group in sequence along the optical axis from the object side to the image side in the lens subsystem of the endoscope imaging system; the second lens group is fixedly arranged in the inner lens barrel, and the inner lens barrel can move back and forth in the fixed lens barrel, and the first lens group is fixedly arranged in the fixed lens barrel, and on the object side of the inner lens barrel. When adjusting the field of view angle of the endoscope imaging system, that is, adjusting the object side working distance, when moving the inner lens barrel along the optical axis, only the second lens group will be moved, and the first lens group will not be moved. When adjusting the image clarity, only one lens group needs to be moved to ensure that when the endoscope system is connected to different endoscopes, the image clarity can be adjusted during the process of adjusting the imaging field of view, so as to ensure that a clear image is obtained. At the same time, compared with adjusting the entire optical system inside the adapter, only one lens group is moved, and the adjustment action will be lighter.

[0073] After introducing the design concept of the embodiment of the present application, the application scenario set in the present application is briefly described below. It should be noted that the following scenario is only used to illustrate the embodiment of the present application and is not limited. In the specific implementation, the technical solution provided by the embodiment of the present application can be flexibly applied according to actual needs.

[0074] Figure 1 A structural schematic diagram of an endoscope device in an embodiment of the present application is exemplarily 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 examinations and surgeries to collect image data of the examinations and surgeries; its key components may include one or more of a camera, a button, a camera host, a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor, a video cable, an optical adapter, an objective lens field of view, a mirror rod, a communication port, and a video output interface. The camera host can be connected to a display through a video output interface, and connected to a cold light source host through a communication port.

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

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

[0078] Cold light sources can be used to provide illumination for endoscopes during endoscopic examinations and surgeries; their key components usually include: a cold light source host, a light guide, a communication port, and a cold light source light output interface.

[0079] It should be understood that Figure 1The schematic diagram of the structure of the endoscope device shown is only an example, and the endoscope device may have more Figure 1 The more or less components shown in the figure can be combined with two or more components, or 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 device, the operator holds the handle of the endoscope device, points the front end of the endoscope rod toward the detection part, and maintains a certain distance. After each distance change, the adapter lens knob is manually rotated to adjust it to obtain a clear image.

[0081] Among them, in the process of adjusting the field of view angle of the endoscopic imaging system, that is, adjusting the object working distance, the image clarity can be adjusted by moving the optical structure of the spherical lens group with optical focal length in the inner lens barrel back and forth along the optical axis direction, thereby obtaining a clear image.

[0082] The structural design of the endoscope imaging system in the related art means that when the endoscope imaging system adjusts the clarity of the imaging field of view, after rotating the adapter lens knob, the aperture and lens subsystem in the endoscope imaging system can be moved forward and backward to adjust the field of view of the endoscope imaging system, that is, to adjust the object side working distance, and obtain a higher definition image. Figure 2 As shown, L1 represents the gap distance between the aperture and the first window glass, which represents the forward adjustment length of the endoscope imaging system; L2 represents the gap distance between the image side of the last lens of the lens subsystem and the second window glass, which represents the backward adjustment length of the endoscope imaging system; L = L1 + L2, L represents the total adjustment length of the endoscope imaging system. L1 and L2 are used to adjust the field of view angle of the endoscope 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, the entire optical system inside the adapter needs to be adjusted, which limits the process of adjusting the clarity and makes the adjustment action more difficult.

[0084] In order to solve the above problems, an embodiment of the present application provides an endoscope imaging system, which 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.

[0085] 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.

[0086] In the embodiment of the present application, the lens subsystem includes, from the object side to the image side along the optical axis, a first lens group and a second lens group in sequence; the second lens group is fixedly arranged in the inner lens barrel, and the inner lens barrel can move forward and backward in the fixed lens barrel, and the first lens group is fixedly arranged in the fixed lens barrel and on the object side of the inner lens barrel. Among them:

[0087] The first lens group includes, from the object side to the image side along the optical axis: a first lens with positive focal power, the first lens is used to focus light; a first sub-lens group with negative focal power, the image side surface of the last lens in the first sub-lens group along the optical axis from the object side to the image side is a convex surface; the first sub-lens group is used to diverge light; a second sub-lens group with positive focal power, 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 a convex surface; the second sub-lens group is used to focus light; a third sub-lens group with negative focal power, 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 a concave surface; the third sub-lens group is used to diverge light;

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

[0089] Wherein, when adjusting the field of view angle of the endoscope imaging system, that is, adjusting the object-side working distance, the inner lens barrel is moved along the optical axis.

[0090] For example, Figure 3 FIG. 1 is a schematic diagram of an endoscope imaging system according to an embodiment of the present application. The endoscope imaging system includes two parts, the first part includes a first window glass 01, an aperture 02, a lens subsystem 03 and a second window glass 04, and the second part is a detection imaging element 05, including a filter 051, at least two detection imaging surfaces 052 and a beam splitter prism 053.

[0091] Among them, the bonding surface of the splitter prism is coated with a splitter film. The detection imaging element in the embodiment of the present application can realize the splitting function and filtering function of the optical system, thereby realizing the splitting function of the visible light band and the near-infrared band.

[0092] Among them, the lens subsystem includes a first lens group 031 and a second lens group 032; the second lens group 032 is fixedly arranged in the inner lens barrel, and the inner lens barrel can move back and forth in the fixed lens barrel, and the first lens group 031 is fixedly arranged in the fixed lens barrel and on the object side of the inner lens barrel.

[0093] The first lens group 031 includes 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, in the embodiment of the present application, the diaphragm is a necessary part of the endoscopic imaging system and is placed at the front end of the endoscopic imaging system. The diameter of the diaphragm is not greater than 7 mm.

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

[0096] For example, Figure 4 , a schematic diagram of a first lens according to an embodiment of the present 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 a concave surface, and the image side surface is a convex surface.

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

[0098] For example, Figure 5 As shown, a schematic diagram of a first sub-lens group according to an embodiment of the present 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 a convex surface, and the image side surface is a convex surface. Among them, the first cemented mirror includes a first biconvex lens 03121 and a first biconcave lens 03122 in sequence from the object side to the image side along the optical axis, and the first biconvex lens 03121 and the first biconcave lens 03122 are glued together; the object side surface of the first cemented mirror is a convex surface, and the image side surface is a concave surface. The second cemented mirror includes a second biconcave lens 03123 and a second biconvex lens 03124 in sequence from the object side to the image side along the optical axis, and the second biconcave lens 03123 and the second biconvex lens 03124 are glued together; the object side surface of the second cemented mirror is a concave surface, and the image side surface is a convex surface.

[0099] Optionally, in the embodiment of the present application, the second sub-lens group includes 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 glued together.

[0100] For example, Figure 6 As shown in FIG. 1 , a schematic diagram of a second sub-lens group according to an embodiment of the present application. The left side of the second sub-lens group 0313 is the object side, and the right side is the image side. Figure 6 In the figure, 03131 represents a third biconvex lens, 03132 represents a third biconcave lens, and 03133 represents a fourth biconvex lens; the object side surface of the second sub-lens group is a convex surface, and the image side surface is a convex surface.

[0101] Optionally, in the embodiment of the present application, the third sub-lens group includes 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 glued together.

[0102] For example, Figure 7 As shown in FIG. 1 , a schematic diagram of a third sub-lens group according to an embodiment of the present 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 figure, 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 embodiment of the present application, the second lens group includes 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.

[0104] For example, Figure 8 As shown, a schematic diagram of a second lens group in an embodiment of the present 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 figure, 0321 represents a fifth biconvex lens, and 0322 represents a fourth biconcave lens. The object side surface of the second lens group 032 is a convex surface, and the image side surface is a concave surface.

[0105] It should be noted that, in the embodiment of the present application, the first lens, the first sub-lens group (the first cemented lens and the 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] Among them, 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, and can better compress the length size of the entire system while ensuring the field of view angle.

[0107] The first sub-lens group (the first cemented lens and the second cemented lens) and the third sub-lens group both have negative optical power, which diverges the light beam, so that the deflection angle of the light in each group will not be too large, effectively balancing the aberrations of the calibration system.

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

[0109] Optionally, the embodiments of the present 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 this application does not impose any limitation on this.

[0111] Based on Fig. 9 The endoscopic imaging system shown enables the present application to adjust the image clarity by moving the second lens group 032 in the inner lens barrel along the optical axis after adjusting the field angle of view of the endoscopic imaging system, that is, adjusting the object working distance, when the handle lens performs visible light and fluorescence imaging detection alone.

[0112] like Fig.10 As shown, a schematic diagram of an adjustment range of an embodiment of the present application. Among them, 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 larger the value of H1+H2 is, the larger the adjustable range is.

[0114] Optionally, the front-to-back adjustment length of the embodiment of the present application satisfies the following conditions:

[0115] H≤13mm, i.e. 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, in the embodiment of the present application, each time the working distance is changed during the use of the endoscope, the probability of unclear field of view imaging when using the endoscope can be reduced by changing the sizes of gaps H1 and H2 and increasing the adjustment range of the handle lens, thereby facilitating adjustment and use by 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] Among them, 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.

[0121] In order to make the process of adjusting image clarity easier, the embodiment of the present application makes the focal length of the endoscope imaging system meet the above conditions, ensuring 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 meets 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 endoscopic imaging system; L2 represents the total thickness of air between each lens in the endoscopic imaging system; and L represents the total length of the endoscopic imaging system.

[0125] In the embodiment of the present application, L1 can represent the total thickness of the non-planar lens (i.e., the curvature of the lens is not all 0), and the total thickness of the lens is limited by the condition of L1 / L≤0.4, and L2 can represent the total thickness of the air between the non-planar lenses (including the moving distance H of the second lens group between the third sub-lens group and the second window glass), and the thickness of the air interval is limited by the condition of L2 / L1≤0.28, so that the lens interval is smaller. This makes the entire optical system more compact, thereby ensuring that the endoscope imaging system is shorter and also reducing the absorption of short-wave light energy by the lens material.

[0126] It should be noted that when the endoscope device does not include the mirror rod part, the separate handle and adapter lens can also provide clear imaging. The application scenario of this situation is Fig.11 shown.

[0127] 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 Fig.11 The distance between the object plane (shown).

[0128] Based on Fig. 9 The endoscope imaging system shown in the embodiment of the present application is suitable for visible light imaging, such as Fig.12 After the visible light enters the endoscope imaging system, it is refracted by the lens in the endoscope imaging system, and finally the received light is split by the beam splitter prism to gather the visible light on the imaging plane corresponding to the visible light.

[0129] Based on Fig. 9 The endoscope imaging system shown in the figure is also applicable to visible light imaging and fluorescence imaging. Fig.13As shown, a schematic diagram of visible light imaging and infrared light imaging in an embodiment of the present application. 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 received light is split by the beam splitter prism to obtain visible light and infrared light, and images are formed on different imaging planes based on the visible light and infrared light.

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

[0131] Among them, when the adapter object distance corresponding to the endoscope imaging system is 110mm, the white light imaging resolution MTF is as follows: Fig.14 When the adapter object distance corresponding to the endoscope imaging system is 120 mm, the fluorescence imaging resolution MTF is as follows: Fig.15 As shown. It is basically close to the diffraction limit. During the movement and adjustment process, the imaging quality will not be greatly affected and is basically stable. That is, after being connected to different endoscope poles, the resolution is also basically stable during the adjustment process.

[0132] It should be noted that the endoscopic imaging system of the embodiment of the present application can accommodate a wider spectrum and is a wide spectrum imaging.

[0133] Among them, when the adapter object distance corresponding to the endoscope imaging system is at the nominal working distance, the white light imaging resolution MTF is as follows: Fig.16 When the adapter object distance corresponding to the endoscope imaging system is at the nominal working distance, the fluorescence imaging resolution MTF is as follows: Fig.17 As shown. It is basically close to the diffraction limit, with high imaging resolution and basically stable imaging quality.

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

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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 A step that specifies a function in one or more boxes.

[0139] 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 a first lens group and a second lens group in sequence from the object side to the image side along the optical axis; the second lens group is fixedly arranged in an inner lens barrel, and the inner lens barrel can move forward and backward in the fixed lens barrel, and the first lens group is fixedly arranged in the fixed lens barrel and is on the object side of the inner lens barrel; The first lens group includes, from the object side to the image side along the optical axis: A first lens with positive optical power, wherein the first lens is used to focus light; a first sub-lens group with negative optical power, wherein the image side surface of the last lens in the first sub-lens group along the optical axis from the object side to the image side is a convex surface; the first sub-lens group is used to diverge light; a second sub-lens group with positive optical power, wherein 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 a convex surface; the second sub-lens group is used to focus light; a third sub-lens group with negative optical power, wherein the image side surface of the last lens in the third sub-lens group from the object side to the image side along the optical axis is a concave surface; the third sub-lens group is used to diverge light; The second lens group is a lens group with positive optical power, and the image side surface of the last lens in the second lens group from the object side to the image side along the optical axis is a concave surface; 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 first meniscus lens whose object side surface along the optical axis from the object side to the image side is a concave surface and whose image side surface is a convex surface.

3. The endoscopic imaging system according to claim 1, characterized in that: The first sub-lens group includes a first cemented lens and a second cemented lens in sequence from the object side to the image side along the optical axis; The first cemented lens includes a first biconvex lens and a first biconcave lens in sequence from the object side to the image side along the optical axis, and the first biconvex lens and the first biconcave lens are cemented together; The second cemented lens includes 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.

4. The endoscopic imaging system according to claim 1, characterized in that: The second sub-lens group includes 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 glued together; The third sub-lens group includes 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 glued together; 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.

5. The endoscopic imaging system according to claim 1, characterized in that: The second lens group includes 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.

6. The endoscopic imaging system according to any one of claims 1 to 5, 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, which is used to adjust the field of view angle of the endoscope imaging system.

7. The endoscopic imaging system according to any one of claims 1 to 5, characterized in that: The endoscopic imaging system meets the following conditions: 1.8≤f1 / f≤2.2, and 1.2≤f2 / f≤1.7 Among them, 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.

8. The endoscopic imaging system according to any one of claims 1 to 5, 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 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 total length of the endoscopic imaging system.

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

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

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