Endoscope illumination device, endoscope, endoscope illumination system, and endoscope system

Abstract

The embodiment of the invention provides an endoscope lighting device, an endoscope, an endoscope lighting system and an endoscope system. The device comprises at least one light source, a collimation module and a dodging piece, the collimating module comprises at least one collimating lens group and is used for receiving emergent light of the light source and forming collimated light; the light uniformizing part comprises at least two micro-lens arrays which are sequentially arranged along an emergent light path of the collimation module, the number of lenses in each micro-lens array is the same, so that the collimated light is divided into multiple beams of sub-light, and the light intensity of each beam of emergent sub-light is uniformly distributed; when the lighting device is connected with the endoscope, at least part of the lenses in the microlens array arranged at the rearmost part are coupled with the incident end faces of the light transmission parts one by one, so that multiple beams of sub-light rays emitted from the at least part of the lenses are transmitted to a target lighting part through the corresponding light transmission parts respectively, and the sub-light rays are overlapped at the target lighting part to form a lighting field. According to the scheme, a lighting field with uniform light intensity can be formed on a target lighting part.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and more particularly to an endoscope lighting device, an endoscope, an endoscope lighting system, and an endoscope system. Background Art

[0002] An endoscope is a very widely used medical instrument at present. The endoscope sends a camera element into a living body through a natural cavity of the living body and returns an image of the internal tissue of the living body. An illumination device for supplying illumination light to its imaging field is provided on or externally connected to the endoscope. Through this illumination device for illumination, a relatively clear image can be captured.

[0003] In the related art, the illumination light emitted by the endoscope lighting device is usually Gaussian distribution or Lambert distribution. In the illumination field formed by this distribution method, since the light intensity of small-angle light (i.e., the light located at the center of the illumination field) is much greater than that of large-angle light (i.e., the light located at the edge of the illumination field), the light intensity distribution in the illumination field is uneven. This non-uniformity will cause the brightness of the captured image to be uneven, seriously affecting the quality of the image. In order to ensure the image quality, usually only the part of the illumination light with relatively uniform light intensity within the center range of the illumination field can be used to provide illumination for the imaging field of the endoscope, resulting in low utilization rate of the illumination light. Summary of the Invention

[0004] In view of the above problems, the present application is proposed. The present application provides an endoscope lighting device, an endoscope, an endoscope lighting system, and an endoscope system.

[0005] According to one aspect of the present application, there is provided an endoscope lighting device for connecting with an endoscope, the endoscope including a plurality of light transmission members, the endoscope lighting device including: at least one light source, a collimation module, and a light homogenizing member; the collimation module includes at least one collimation lens group for receiving the emitted light of at least one light source and forming collimated light; the light homogenizing member includes at least two microlens arrays arranged in sequence along the emission optical path of the collimation module, and the number of lenses in each microlens array of the at least two microlens arrays is the same, so as to divide the collimated light into multiple sub-beams of light and make the light intensity of each emitted sub-beam of light uniformly distributed at each angle; when the endoscope lighting device is connected to the endoscope, at least part of the lenses in the microlens array arranged at the rearmost along the emission optical path of the collimation module in the light homogenizing member are coupled to the incident end faces of the plurality of light transmission members one by one, so that the multiple sub-beams of light emitted from at least part of the lenses are respectively transmitted to the target illumination part through the corresponding light transmission members and superimposed to form an illumination field at the target illumination part.

[0006] Exemplarily, the shape of the projection of the lenses in each of at least two microlens arrays on the projection plane is rectangular or regular hexagonal, and the projection plane is a plane perpendicular to the outgoing optical path of the collimation module.

[0007] Exemplarily, the light homogenizer includes two microlens arrays that are symmetrically distributed with respect to the first central axis, and the first central axis is perpendicular to the outgoing optical path of the collimation module; the shape of the projection of the lenses in each of the two microlens arrays on the projection plane is rectangular; the distance d between the lowest points of the lens surfaces of any one of the two microlens arrays and the lowest points of the lens surfaces of the other microlens array in the target direction satisfies the following requirements: 0.9 ≤ 2 * d * tanA / a ≤ 1.1; 0.9 ≤ 2 * d * tanB / b ≤ 1.1; where a is the length of the rectangle; b is the width of the rectangle; A represents the maximum outgoing angle of the sub-rays in the horizontal direction; B represents the maximum outgoing angle of the sub-rays in the vertical direction; the target direction is the direction parallel to the outgoing optical path of the collimation module.

[0008] Exemplarily, the light homogenizer includes two microlens arrays that are symmetrically distributed with respect to the first central axis, and the first central axis is perpendicular to the outgoing optical path of the collimation module; the shape of the projection of the lenses in each of the two microlens arrays on the projection plane is regular hexagonal; the distance d between the lowest points of the lens surfaces of any one of the two microlens arrays and the lowest points of the lens surfaces of the other microlens array in the target direction satisfies the following requirements: 0.9 ≤ 2 * d * tanC / c ≤ 1.1; where c is the side length of the regular hexagon; C represents the maximum outgoing angle of the sub-rays; the target direction is the direction parallel to the outgoing optical path of the collimation module.

[0009] Exemplarily, when the endoscopic lighting device is connected to the endoscope, the distance between the microlens array arranged at the rearmost along the outgoing optical path of the collimation module in the light homogenizer and the incident end faces of the plurality of light transmission members is less than or equal to a preset distance, so that all the multiple sub-rays emitted from at least some of the lenses enter the incident end faces of the plurality of light transmission members.

[0010] Exemplarily, at least two microlens arrays are arranged in sequence along the outgoing optical path of the collimation module, and the two microlens arrays arranged at the foremost along the outgoing optical path of the collimation module are symmetrically distributed with respect to the first central axis, and the lenses in each of the at least two microlens arrays are symmetrically distributed with respect to the second central axis, the first central axis is perpendicular to the outgoing optical path of the collimation module, and the second central axis is parallel to the outgoing optical path of the collimation module.

[0011] Exemplarily, the lens curvatures between the microlens arrays other than the microlens array arranged at the foremost along the outgoing optical path of the collimation module among at least two microlens arrays are different.

[0012] According to another aspect of the present application, an endoscope is provided for connection with an endoscope lighting device, which is the above-mentioned endoscope lighting device; the endoscope includes: a plurality of light transmission members. When the endoscope is connected to the endoscope lighting device, the incident end faces of the plurality of light transmission members are respectively coupled to at least some of the lenses in the microlens array arranged at the rearmost position along the exit optical path of the collimation module in the light homogenizing member, so that multiple sub-beams of light emitted from at least some of the lenses are respectively transmitted to the target illumination site through the corresponding light transmission members and superimposed to form an illumination field at the target illumination site.

[0013] Exemplarily, the light transmission member is an optical fiber; the light-emitting sections of the plurality of optical fibers are integrated to form at least one optical fiber bundle.

[0014] Exemplarily, a fixing bracket is further included; a plurality of mounting holes corresponding to at least some of the lenses one by one are provided on the fixing bracket; the incident ends of the plurality of light transmission members are respectively fixed in the plurality of mounting holes, so that when the endoscope is connected to the endoscope lighting device, multiple sub-beams of light emitted from at least some of the lenses are respectively transmitted to the target illumination site through the corresponding light transmission members.

[0015] According to still another aspect of the present application, an endoscope lighting system is provided, including: at least one light source, a collimation module, a light homogenizing member, and a plurality of light transmission members; the collimation module includes at least one collimation lens group for receiving the emitted light of at least one light source and forming collimated light; the light homogenizing member includes at least two microlens arrays arranged in sequence along the exit optical path of the collimation module, and the number of lenses in each microlens array among the at least two microlens arrays is the same, so as to divide the collimated light into multiple sub-beams of light and make the light intensity of each emitted sub-beam of light evenly distributed at various angles; at least some of the lenses in the microlens array arranged at the rearmost position along the exit optical path of the collimation module in the light homogenizing member are respectively coupled to the incident end faces of the plurality of light transmission members, so that multiple sub-beams of light emitted from at least some of the lenses are respectively transmitted to the target illumination site through the corresponding light transmission members and superimposed to form an illumination field at the target illumination site.

[0016] According to still another aspect of the present application, an endoscope system is provided, including the above-mentioned endoscope lighting device and / or the above-mentioned endoscope, or including the above-mentioned endoscope lighting system.

[0017] According to the above technical solutions, by using the light homogenizing member to cut the emitted light from a large beam into multiple light spots, it is beneficial to reduce the non-uniformity of the light intensity of the emitted light; by using a plurality of light transmission members to transmit the light spots formed by the light homogenizing member to the target illumination site, it is beneficial to avoid changing the light spot angle. In short, by combining the light homogenizing member with the light transmission members, it is beneficial to form an illumination field with uniform light intensity at the target illumination site, thereby being beneficial to improving the image quality and having a high light utilization rate. At the same time, the lighting device of this solution has few optical elements, a simple coupling structure, and is easy to produce and assemble.

[0018] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. Description of the Drawings

[0019] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other purposes, features and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0020] Figure 1 A schematic diagram showing the illumination field formed by an endoscope lighting device in the related art;

[0021] Figure 2 A schematic structural diagram showing an endoscope lighting system according to an embodiment of the present application;

[0022] Figure 3 A schematic structural diagram showing a light homogenizing member according to an embodiment of the present application;

[0023] Figure 4 A schematic diagram showing the illumination field according to an embodiment of the present application;

[0024] Figure 5 A schematic diagram showing the projected shape of a lens on a projection plane according to an embodiment of the present application;

[0025] Figure 6 A schematic structural diagram showing an endoscope lighting system according to another embodiment of the present application;

[0026] Figure 7 A schematic structural diagram showing an endoscope lighting system according to yet another embodiment of the present application;

[0027] Figure 8 A schematic diagram showing multiple light spots according to an embodiment of the present application; and

[0028] Figure 9 A schematic diagram showing the illumination field according to another embodiment of the present application. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0030] An endoscope can send a camera element into a living body through a natural body cavity and return an image of the internal tissues of the living body, thereby realizing the detection of the observation site of a target object. An endoscope generally includes an objective lens and an illumination device. Among them, the objective lens is used to collect an image of a target site (i.e., a target illumination site), and the illumination device is used to illuminate the target illumination site to improve the clarity of the collected image. In the related art, the illumination light provided by the illumination device is usually Gaussian distribution or Lambert distribution. In the illumination field formed by this distribution method, since the light intensity of small-angle light is much greater than that of large-angle light, the light intensity distribution in the illumination field is uneven, and the light intensity in the central region of the illumination field is much greater than that in the edge region. Figure 1 Schematic diagram showing the illumination field formed by the endoscope illumination device in the related art. Figure 1 The upper picture shows the light spot of the illumination field. Figure 1 The lower picture shows the light intensity distribution diagram of the illumination field. In the light intensity distribution diagram, the abscissa represents the position, and the ordinate represents the light intensity. As Figure 1 shown, it can be seen that the light intensity of the illumination field decreases from the center to the edge, and the light intensity in the central region is much greater than that in the edge region. Due to the uneven light intensity distribution in the illumination field, the brightness of the collected image is uneven. Thus, the quality of the image is seriously affected. In some embodiments of the related art, light with relatively uniform light intensity within the central range is used to cover the imaging field of view, and the light with relatively uneven light intensity outside the imaging field of view is wasted, resulting in low light energy utilization rate. In view of this, the present application provides an endoscope illumination device, an endoscope, an endoscope illumination system, and an endoscope system. The endoscope illumination system can form an illumination field with uniform light intensity at the target illumination site, which is beneficial to improving the image quality and the light utilization rate.

[0031] According to one aspect of the present application, an endoscope illumination system is provided, including: at least one light source, a collimation module, a light homogenizing member, and a plurality of light transmission members; the collimation module includes at least one collimation lens group for receiving the emitted light rays of at least one light source and forming collimated light rays; the light homogenizing member includes at least two microlens arrays arranged in sequence along the emission optical path of the collimation module, and the number of lenses in each microlens array among the at least two microlens arrays is the same, so as to divide the collimated light rays into multiple sub-light rays and make the light intensity of each emitted sub-light ray uniformly distributed at various angles; at least part of the lenses in the microlens array arranged at the rearmost position along the emission optical path of the collimation module in the light homogenizing member are coupled to the incident end faces of the plurality of light transmission members one by one, so that the multiple sub-light rays emitted from at least part of the lenses are respectively transmitted to the target illumination site through the corresponding light transmission members and superimposed to form an illumination field at the target illumination site.

[0032] It should be noted that the light intensity of each sub-light ray emitted by the light homogenizing member is uniformly distributed at various angles, specifically, for each sub-light ray emitted by the light homogenizing member, the light intensity difference between the light rays at different angles is within a preset threshold, and the preset threshold can be determined according to the uniformity requirement of the illumination light for endoscope imaging.

[0033] For the convenience of description, in this article, the microlens array arranged at the foremost position along the emission optical path of the collimation module in the light homogenizing member (i.e., the microlens array closest to the collimation module) can be referred to as the first microlens array, and the microlens array arranged at the rearmost position along the emission optical path of the collimation module in the light homogenizing member (i.e., the microlens array closest to the light transmission member) can be referred to as the second microlens array.

[0034] In the solution of the present application, the first microlens array among the at least two microlens arrays can be used to receive the collimated light rays and divide the collimated light rays into multiple sub-light rays. The microlens arrays other than the first microlens array among the at least two microlens arrays can be used to perform spherical aberration compensation on the multiple sub-light rays so that the light intensity distribution of each sub-light ray is uniform at various angles.

[0035] Optionally, the number of light sources in at least one light source can be selected as needed. In one embodiment, at least one light source may include only one light source. For example, at least one light source may include only one white light source. The outgoing light emitted by the white light source is collimated by the collimating lens group to form collimated light, which is then transmitted to the first microlens array. The collimated light transmitted to the first microlens array may be referred to as single-source collimated light. In another embodiment, at least one light source may include multiple light sources. The outgoing light of the multiple light sources can be collimated by their respective corresponding collimating lens groups, and then synthesized into a beam of collimated light through a light combining component and transmitted to the first microlens array. The collimated light transmitted to the first microlens array may be referred to as multi-source collimated light. The manner in which the collimated light corresponding to each of the multiple light sources is synthesized into a beam of collimated light will be described in detail below. In a specific embodiment, at least one light source may include two light sources. For example, a white light source and a special light source, and the wavelength band of the special light can be determined according to actual application requirements, such as any one of blue-violet light, blue light, green light, red light, amber light, etc. In another specific embodiment, at least one light source may include three light sources, such as a red light source, a green light source, and a blue light source. It can be understood that the above number and type of light sources are only examples. The specific number and type of light sources can be selected according to the required light source spectrum and the requirements for the image effect, and the present application does not limit them.

[0036] Optionally, the collimated light received by the first microlens array may be single-source collimated light or multi-source collimated light. The specific type of collimated light can be determined according to the number of light sources in the lighting device. For ease of description, hereinafter, the collimated light received by the first microlens array will be simply referred to as target collimated light.

[0037] Figure 2 The structural schematic diagram of an endoscope lighting system according to an embodiment of the present application is shown. In this embodiment, the number of light sources is one. The type of light source is a white light source. As Figure 2 shown, the lighting system includes a light source 1-1, a collimating lens group 21-1, a light homogenizing member 3, and a plurality of light transmitting members 4. The collimating lens group 21-1 includes two collimating lenses, and the two collimating lenses are arranged in sequence along the outgoing light path of the light source 1-1. Each light transmitting member 4 includes a light incident section 4-1 and a light outgoing section 4-2. The multiple light spots formed by the light homogenizing member 3 are transmitted to the target illumination site through the light incident section 4-1 and the light outgoing section 4-2.

[0038] Optionally, the number of microlens arrays in at least two microlens arrays can be set as needed. The more the number of microlens arrays, the more times of spherical aberration compensation for the light spots. However, correspondingly, a larger number of microlens arrays will increase the overall size of the lighting system. Therefore, in actual use, the number of microlens arrays can be set according to the size requirements of the lighting system.

[0039] Optionally, at least two microlens arrays may include a plurality of independently arranged microlens arrays. Alternatively, at least two microlens arrays may be constructed as a single entity. Figure 3 The structural schematic diagram of a light homogenizer according to an embodiment of the present application is shown. As Figure 3 shown, the light homogenizer 3 includes a first microlens array 3-1 and a second microlens array 3-2. In this embodiment, the first microlens array 3-1 and the second microlens array 3-2 are connected to form a single entity. The light spot formed by the first microlens array 3-1 is transmitted inside the entity formed by the first microlens array 3-1 and the second microlens array 3-2. Compared with the independently arranged manner, this overall arrangement is conducive to reducing the light loss during the light spot transmission, thereby contributing to further improving the uniformity of the light intensity distribution in the illumination field.

[0040] Optionally, the light transmitting member may be any existing or future-developed optical transmission element having a total reflection effect. For example, the light transmitting member may be any one of an optical fiber, a glass rod, and a light duct.

[0041] Exemplarily, the light transmitting member is an optical fiber. The light output section includes at least one optical fiber bundle. It can be understood that the optical fiber itself has flexibility, and the flexibility of the optical fiber can be utilized to bundle a plurality of optical fibers respectively to form at least one optical fiber bundle. The number of at least one optical fiber bundle can be set as required. For example, the number of optical fiber bundles can be one, two, or three. In a specific embodiment, the number of optical fiber bundles is two. The number of optical fibers included in each optical fiber bundle is the same. In other words, in this embodiment, a plurality of optical fibers are evenly divided into two parts. The two parts of optical fibers respectively form two optical fiber bundles. In this solution, by using an optical fiber as the light transmitting member, it is conducive to reducing the light loss during the light transmission, thereby contributing to further improving the uniformity of the light intensity distribution in the illumination field.

[0042] In the solution of this example, for any one of the multiple light transmission members, the light transmission member can be directly aligned with the corresponding lens. In some embodiments, the alignment between the light transmission member and the corresponding lens can be ensured by an external structure for fixing the light transmission member and the light homogenizing member. For example, the fixing member of the light homogenizing member and the fixing member for fixing the multiple light transmission members. Exemplarily, the fixing member for fixing the multiple light transmission members is a fixing bracket, and a plurality of mounting holes corresponding to at least some of the lenses are provided on the fixing bracket; the incident ends of the multiple light transmission members are respectively fixed in the multiple mounting holes, so that when the fixing bracket of the light transmission member is connected to the fixing member of the light homogenizing member, multiple sub-beams of light emitted from at least some of the lenses are respectively transmitted to the target illumination part through the corresponding light transmission members. In the solution of this example, the multiple light transmission members can be respectively fixed by the multiple mounting holes on the fixing bracket. Thus, the accurate coupling between the light transmission member and the corresponding lens can be facilitated, which helps to ensure that the sub-beams of light emitted from the lens enter the light transmission member. In a specific embodiment, the fixing bracket of the multiple light transmission members can be a metal block with array holes, and each array hole is a mounting hole. The center pitch of the array holes of the metal block can be the same as the center pitch of the protrusions of the microlens array. The fixing member of the light homogenizing member and the fixing bracket of the multiple light transmission members can be connected together by any existing or future-developed connection method. For example, they can be connected by means of screw fit, hole-shaft fit, etc. For another example, the fixing member of the light homogenizing member and the fixing bracket of the light transmission member can be arranged in the same groove structure to achieve the direct alignment between the light transmission member and the corresponding lens.

[0043] Optionally, the diameter of the optical fiber is greater than the circumscribed circle diameter of the light spot output from the corresponding lens to the incident end face of the optical fiber. Thus, it helps to ensure that all the sub-beams of light enter the corresponding optical fiber, which helps to prevent light loss.

[0044] Exemplarily, the light transmission member is a glass rod. In a specific embodiment, for any one glass rod, one end of the glass rod is an incident section, and the other end is bent and integrated with other glass rods to form an exit section. The bending angles of the respective glass rods can be determined according to the position of the glass rod in the light transmission member.

[0045] Exemplarily, the light transmission member is an optical duct. The exit section includes at least one light guiding beam. It can be understood that the optical duct itself has flexibility, and the flexibility of the optical duct can be utilized to bundle multiple optical ducts to form at least one light guiding beam.

[0046] In this solution, at least some of the lenses include lenses for outputting multiple sub-beams of light. It can be understood that the cross-section of the collimated light is usually circular. When the light homogenizing member 3 adopts Figure 3When in the shape shown, some lenses on the first microlens array in the light homogenizing element 3 do not receive collimated light, and correspondingly, some corresponding lenses on the second microlens array cannot output sub-rays. In some alternative embodiments, the light transmitting element may include a plurality of light transmitting elements corresponding one-to-one to all the lenses in the second microlens array. It can be understood that when the focal length of the collimation module corresponding to the light source changes, the cross-sectional diameter of the collimated light formed by the light source also changes. If the light transmitting element only includes a plurality of light transmitting elements corresponding one-to-one to some of the lenses in the second microlens array, when the cross-section of the collimated light becomes larger, some of the sub-rays output by the lenses may be omitted because there is no corresponding light transmitting element. In the technical solution of this embodiment, by providing a plurality of light transmitting elements corresponding one-to-one to all the lenses in the second microlens array, it helps to prevent the omission of sub-rays when the focal length of the collimation module corresponding to the light source changes, thereby facilitating ensuring the light intensity uniformity of the illumination field formed by multiple sub-rays.

[0047] It can be understood that the light intensity non-uniformity of a small light beam is much lower than that of a large light beam. In the solution of this application, the first microlens array in the light homogenizing element can cut a large light beam (i.e., the collimated light incident on the first microlens array) into multiple sub-rays. After the converging effect of the lenses in the first microlens array and through spherical aberration compensation for the multiple sub-rays by the microlens arrays other than the first microlens array in at least two microlens arrays, the sub-rays are emitted through the second microlens array. The multiple sub-rays after spherical aberration compensation are superimposed on each other. Based on the symmetry of the array arrangement, that is, the symmetry between the emitted sub-rays, the non-uniformity of the sub-rays cancels each other out, making the light intensity distribution of the sub-rays emitted from the second microlens array uniform at different divergence angles (i.e., the light intensity at each angle is close). The light spots formed by the multiple sub-rays are superimposed at the target illumination area. Since the light intensity distribution of the sub-rays is uniform at different divergence angles, the light intensity distribution of the superimposed illumination field can be made uniform. Figure 4 Shows a schematic diagram of an illumination field according to an embodiment of the present application. As Figure 4 shown, multiple light spots are superimposed at the target illumination area to form an illumination field. It can be seen that by superimposing the light spots formed by multiple sub-rays, an illumination field with distinct boundaries and uniform light intensity can be formed.

[0048] Optionally, each lens on the first microlens array has the same curvature. In this embodiment, by making each lens on the first microlens array have the same curvature, it is beneficial to make the converging effect of each lens on the light spot consistent, thereby helping to further improve the light intensity uniformity of the illumination field.

[0049] According to the above technical solution, by using a light homogenizing element to cut the outgoing light beam into multiple light spots, it is beneficial to reduce the non-uniformity of the light intensity of the outgoing light; by using multiple light transmitting elements to directly transmit the multiple sub-light beams formed by the light homogenizing element to the target illumination area, it is beneficial to avoid changing the divergence angle of the sub-light beams. In short, by combining the light homogenizing element with the light transmitting element, this solution is beneficial to form an illumination field with uniform light intensity at the target illumination area, thereby being beneficial to improving the image quality. At the same time, the illumination device of this solution has fewer optical elements, a simple coupling structure, and is easy to produce and assemble.

[0050] Exemplarily, the shape of the projection of each lens in each microlens array on the projection plane is rectangular or regular hexagon, and the projection plane is a plane perpendicular to the outgoing light path of the collimation module.

[0051] It can be understood that the edge position of the lens (i.e., the junction between lenses) can be regarded as a small plane. When the collimated light forms multiple sub-light beams through each lens, the light irradiated on each small plane will be wasted. Therefore, the more edges the lens has, the greater the light loss when the collimated light forms multiple sub-light beams. In this example, the shape of the projection of the lens on the projection plane is rectangular (such as Figure 3 the lens in) or regular hexagon. And since the imaging field of view of the endoscope is usually rectangular or regular hexagon, shaping the sub-light beams into rectangular or regular hexagon can be adapted to the imaging field of view of the endoscope. Thus, it helps to reduce the number of lens edges, thereby helping to reduce light loss. At the same time, setting the lens to an even number of sides is also beneficial to ensuring that the light spots formed by each lens are symmetrically distributed based on the central axis parallel to the outgoing light path of the collimation module (i.e., the second central axis described below), thereby being beneficial to ensuring the symmetrical superposition of the light spots formed by each sub-light beam at the target illumination area.

[0052] Optionally, the size of each lens in each microlens array can be set as needed. The smaller the lens, the more lenses in the microlens array and the more light spots are formed. However, at the same time, the increase in the number of lenses will also lead to an increase in the number of lens edges in the microlens array and an increase in light loss. Therefore, the appropriate lens size can be selected based on the light loss at the lens edge and the number of sub-light beams.

[0053] Figure 5 A schematic diagram showing the projection shape of each lens in a microlens array according to an embodiment of the present application. As Figure 5 shown, each lens of the microlens array forms multiple regular hexagons on the projection plane. Each regular hexagon is symmetrically distributed based on the second central axis.

[0054] According to the above technical solution, by making the shape of the projection of the lens on the projection plane be a rectangle or a regular hexagon, on the one hand, it helps to reduce the number of edges in the microlens array (i.e., the total number of edges of each lens), reducing light loss. On the other hand, setting the lens to have an even number of sides is also beneficial to ensuring that the light spots formed by the sub-rays emitted from each lens at the target illumination area are symmetrically distributed based on the second central axis, thereby facilitating the symmetric superposition of each light spot at the target illumination area and helping to form an illumination field with uniform light intensity.

[0055] Exemplarily, the light homogenizing member includes two microlens arrays, the two microlens arrays are symmetrically distributed with respect to the first central axis, and the first central axis is perpendicular to the outgoing light path of the collimation module; the shape of the projection of the lens in each microlens array on the projection plane is a rectangle. The distance d between the lowest points of the lens surfaces of any one of the two microlens arrays and the lowest points of the lens surfaces of the other microlens array in the target direction satisfies the following requirements:

[0056] 0.9 ≤ 2 * d * tanA / a ≤ 1.1;

[0057] 0.9 ≤ 2 * d * tanB / b ≤ 1.1;

[0058] Wherein, a is the length of the rectangle. b is the width of the rectangle. A represents the maximum outgoing angle of the sub-ray in the horizontal direction. B represents the maximum outgoing angle of the sub-ray in the vertical direction. The target direction is the direction parallel to the outgoing light path of the collimation module.

[0059] Optionally, the maximum outgoing angle A of the sub-ray in the horizontal direction and the maximum outgoing angle B of the sub-ray in the vertical direction can be empirical values or theoretical values determined through experiments.

[0060] Still taking Figure 3 as an example to illustrate the distance d. As Figure 3 shown, the two microlens arrays are the first microlens array 3-1 and the second microlens array 3-2 respectively. The lens in each microlens array can have a spherical arc surface, there are multiple lenses 3-3 on both microlens arrays, and the curvature of each lens 3-3 is the same. The lowest points of the lens surfaces of the multiple lenses 3-3 on the first microlens array 3-1 are located on the same plane L1, the lowest points of the lens surfaces of the multiple lenses 3-3 on the second microlens array 3-2 are located on the same plane L2, and the distance d is the distance between L1 and L2.

[0061] It can be understood that when 2*d*tanA / a = 1, the first microlens array just refracts the light entering its edge onto the second microlens array and emits it at an angle of A°, which is an important reason for limiting the angle of each sub-ray after passing through the microlens array within the target A°. By making the distance d satisfy 0.9 ≤ 2*d*tanA / a ≤ 1.1 and 0.9 ≤ 2*d*tanB / b ≤ 1.1, it is beneficial to make the light intensity distribution of the light in the illumination field more uniform at different divergence angles, thereby further improving the uniformity of the light intensity in the illumination field. In addition, the second microlens array can also well compensate for the spherical aberration of the non-0° collimated light entering the first microlens array, making the angles of the collimated light entering the first microlens array from the same point and exiting from the second microlens array the same or close, further improving the uniformity of the light intensity distribution of the light within each sub-ray at different divergence angles. In the solution of this application, by restricting the distance d, it helps to further improve the uniformity of the light intensity distribution of each sub-ray at different divergence angles, thereby helping to better ensure the uniformity of the light intensity in the illumination field.

[0062] Exemplarily, the light homogenizer includes two microlens arrays, which are symmetrically distributed with respect to the first central axis, and the first central axis is perpendicular to the outgoing light path of the collimation module; the shape of the projection of the lenses in each microlens array of the two microlens arrays on the projection plane is a regular hexagon. The distance d between the lowest points of the lens surfaces of any one of the two microlens arrays in the target direction satisfies the following requirements:

[0063] 0.9 ≤ 2*d*tanC / c ≤ 1.1;

[0064] where c is the side length of the regular hexagon. C represents the maximum outgoing angle of the sub-ray; the target direction is the direction parallel to the outgoing light path of the collimation module.

[0065] Optionally, the maximum outgoing angle C of the sub-ray can be an empirical value or a theoretical value determined through experiments.

[0066] In the case where the projection of the lens is a regular hexagon, when 0.9 ≤ 2*d*tanC / c ≤ 1.1, the light intensity distribution of the light in the illumination field is more uniform at different divergence angles, which is beneficial to further improving the uniformity of the light intensity in the illumination field. Therefore, in this solution, by restricting the distance d using C and c, it helps to better ensure the uniformity of the light intensity in the illumination field.

[0067] Exemplarily, at least one light source includes a first light source and at least one second light source. The collimation module includes at least one collimating lens group and at least one light combining member. The at least one collimating lens group corresponds to the at least one light source one by one. The at least one light combining member corresponds to the at least one second light source and its corresponding collimating lens group one by one. The outgoing light path of each second light source in the at least one second light source is perpendicular to the outgoing light path of the first light source. The at least one collimating lens group is correspondingly arranged on the outgoing light path of the at least one light source one by one, and each collimating lens group is used to receive the outgoing light of the corresponding light source and form the corresponding collimated light. The at least one light combining member is sequentially arranged between the collimating lens group corresponding to the first light source and the light homogenizing member along the outgoing light path of the first light source. Among them, the light combining member arranged at the forefront along the outgoing light path of the first light source is used to combine the collimated light emitted from the collimating lens group corresponding to the first light source and the collimated light emitted from the collimating lens group corresponding to this light combining member to form the corresponding combined light beam. Each of the remaining light combining members is used to combine the collimated light emitted from the collimating lens group corresponding to this light combining member and the combined light beam emitted from the previous light combining member to form the corresponding combined light beam. Among them, the combined light beam emitted from the light combining member arranged at the rearmost along the outgoing light path of the first light source is the collimated light emitted from the collimation module (which can be called the target collimated light).

[0068] Figure 6 FIG. shows a schematic structural diagram of an endoscope illumination system according to another embodiment of the present application. In this embodiment, the number of light sources is two. As Figure 6 shown, the illumination system includes a light source 1-1, a light source 1-2, a collimating lens group 21-1, a collimating lens group 21-2, a light combining member 22-1, a light homogenizing member 3, and a light transmitting member 4. The outgoing light of the light source 1-2 is perpendicular to the outgoing light of the light source 1-1. Both the collimating lens group 21-1 and the collimating lens group 21-2 include two collimating lenses. The two collimating lenses in the collimating lens group 21-1 are sequentially arranged along the outgoing light path of the light source 1-1. The two collimating lenses in the collimating lens group 21-2 are sequentially arranged along the outgoing light path of the light source 1-2. The light transmitting member 4 includes a light incident section 4-1 and a light outgoing section 4-2. In this embodiment, the outgoing light emitted by the light source 1-1 is collimated by the collimating lens group 21-1 to form a first collimated light, and the outgoing light emitted by the light source 1-2 is collimated by the collimating lens group 21-2 to form a second collimated light. The first collimated light and the second collimated light are combined by the light combining member 22-1 to form a combined light beam (i.e., the target collimated light), and are emitted to the light homogenizing member 3. The light homogenizing member 3 forms multiple sub-light beams, and transmits them to the target illumination area through the light incident section 4-1 and the light outgoing section 4-2. In this embodiment, the light source 1-1 can be a white light source, and the light source 1-2 can be a special light source.

[0069] Figure 7Schematic structural diagram of an endoscopic lighting system according to another embodiment of the present application is shown. In this embodiment, the number of light sources is three. As Figure 7 shown, the lighting system includes light sources 1-1, 1-2, 1-3, collimating lens groups 21-1, 21-2, 21-3, light combining member 22-1, light combining member 22-2, light homogenizing member 3, and light transmitting member 4. The emitted light rays of light source 1-2 and light source 1-3 are both perpendicular to the emitted light ray of light source 1-1. Each of collimating lens groups 21-1, 21-2, and 21-3 includes two collimating lenses. The two collimating lenses in collimating lens group 21-1 are arranged in sequence along the emitted light path of light source 1-1. The two collimating lenses in collimating lens group 21-2 are arranged in sequence along the emitted light path of light source 1-2. The two collimating lenses in collimating lens group 21-3 are arranged in sequence along the emitted light path of light source 1-3. Light transmitting member 4 includes a light incident section 4-1 and a light exiting section 4-2. In this embodiment, the emitted light ray emitted by light source 1-1 forms a first collimated light ray after being collimated by collimating lens group 21-1, the emitted light ray emitted by light source 1-2 forms a second collimated light ray after being collimated by collimating lens group 21-2, and the emitted light ray emitted by light source 1-3 forms a third collimated light ray after being collimated by collimating lens group 21-3. The first collimated light ray and the second collimated light ray are combined by light combining member 22-1 to form a first combined light beam. The first combined light beam and the third collimated light ray are combined by light combining member 22-2 to form a second combined light beam (i.e., the target collimated light ray), and are emitted to light homogenizing member 3. Light homogenizing member 3 forms multiple sub-light rays, and transmits them to the target illumination area via light incident section 4-1 and light exiting section 4-2. In this embodiment, light source 1-1 can be a red light source, light source 1-2 can be a green light source, and light source 1-3 can be a blue light source. The three light sources are combined into a beam of white light (the second combined light beam) through two light combining members, and are shaped into multiple sub-light rays by light homogenizing member 3. Each of the multiple sub-light rays enters the light incident section 4-1 of the corresponding light transmitting member, and is transmitted to the target illumination area via light exiting section 4-2, so as to provide an illumination field with distinct boundaries and uniform light intensity distribution for the imaging of the endoscope.

[0070] The above arrangement of multiple light sources is only one conventional arrangement method. In other embodiments, the arrangement of each light source is not limited to this. For example, the optical paths of some second light sources can also be parallel to the optical path of the first light source, and their emitted light rays are introduced into the emitted light path of the first light source through a reflector or the like.

[0071] In the related art, when a multi-channel light source is included in an endoscope, the light rays emitted by the multi-channel light source are combined into the same light ray and then irradiated on the target illumination area. However, limited by the size of the endoscope itself, the aperture of the light combining optical path for combining the light rays emitted by the multi-channel light source into the same light ray is limited, resulting in the large-angle light in the light rays being cut off. As described above, the light intensity of the small-angle light is much greater than that of the large-angle light. After cutting off the large-angle light with relatively weak light intensity, the brightness of the edge area of the illumination field will be further reduced. Thus, the light intensity distribution in the illumination field is further uneven. In the solution of the present application, a light homogenizing member is used to cut the outgoing light rays from a large light beam into multiple sub-light rays, which is beneficial to reducing the unevenness of the light intensity of the outgoing light rays. At the same time, through the symmetric superposition of multiple light spots formed by multiple sub-light rays on the target illumination area, it helps to make the light intensity distribution of light at each divergence angle uniform, thereby helping to improve the uniformity of the light intensity in the illumination field. This solution is beneficial to improving the image quality. Therefore, in the embodiments using a multi-channel light source to emit light, through the light homogenizing member and the light transmitting member of the present application, not only can the problem of uneven light intensity distribution of a single light source itself be solved, but also the problem of uneven light intensity distribution further caused by the limitation of the light combining optical path of such a multi-channel light source can be further solved.

[0072] Exemplarily, the distance between the microlens array arranged at the rearmost along the outgoing optical path of the collimation module in the light homogenizing member and the incident end faces of multiple light transmitting members is less than or equal to a preset distance, so that all the multiple sub-light rays emitted from at least some of the lenses enter the incident end faces of the multiple light transmitting members.

[0073] It can be understood that light rays are usually divergent. The greater the distance between the incident end faces of multiple light transmitting members and the second microlens array, the larger the spot area formed by the sub-light rays on the corresponding incident end faces. Therefore, by making the distance between the incident end faces of multiple light transmitting members and the second microlens array less than or equal to a preset distance, it helps to ensure that the light spots formed by the sub-light rays all enter the corresponding light transmitting members as much as possible, thereby preventing light loss. Optionally, the preset distance can be an experimental value or a theoretical value determined according to simulation experiments. Figure 8 A schematic diagram of multiple light spots according to an embodiment of the present application is shown. In this embodiment, multiple light transmitting members correspond to the lenses in the second microlens array one by one. Each white ring in the figure represents the light incident end of each light transmitting member. As Figure 8 shown, multiple light spots formed by multiple sub-light rays emitted by the second microlens array on the corresponding light incident end faces enter the light transmitting members through the light incident end faces, and are transmitted to the target illumination area through the light output sections of the light transmitting members.

[0074] According to the above technical solution, by making the distance between the incident end faces of multiple light-transmitting members and the second microlens array less than or equal to a preset distance, it helps to ensure that all sub-rays enter the corresponding light-transmitting members, thereby preventing light loss. At the same time, this solution also helps to control the transmission distance of the sub-rays in the air, making the transmission distance as short as possible, which further helps to reduce light loss.

[0075] Exemplarily, at least two microlens arrays are sequentially arranged along the outgoing light path of the collimation module, and the two microlens arrays arranged at the forefront along the outgoing light path of the collimation module are symmetrically distributed with respect to the first central axis. The lenses in each microlens array of the at least two microlens arrays are symmetrically distributed with respect to the second central axis. The first central axis is perpendicular to the outgoing light path of the collimation module, and the second central axis is parallel to the outgoing light path of the collimation module.

[0076] Still taking Figure 8 the illustrated embodiment as an example for description. As Figure 8 shown, the multiple light spots formed by multiple sub-rays on the incident end face of the corresponding light-transmitting member are symmetrically distributed with respect to the second central axis. When the multiple sub-rays are transmitted to the target illumination area, the multiple light spots formed by the multiple sub-rays on the target illumination area are symmetrically superimposed, which helps to make the light intensity distribution uniform at all angles in the illumination field. Figure 9 Fig. shows a schematic diagram of an illumination field according to another embodiment of the present application. Figure 9 The gray values of the pixels in Figure 9 represent the light intensity at the corresponding positions. As Figure 9 shown, multiple light spots are superimposed on the target illumination area to form an illumination field. It can be seen that the boundary in this illumination field is distinct, the light intensities at different divergence angles are similar, and the intensity distributions of the light in the horizontal and vertical directions are relatively uniform. Illuminated by this illumination field, it helps to obtain an endoscope image with higher image quality.

[0077] Taking Figure 3 as an example to illustrate the first central axis. As Figure 3 shown, the first central axis is located between the first microlens array and the second microlens array and is perpendicular to the second central axis. The first microlens array and the second microlens array are symmetrically distributed with respect to the first central axis.

[0078] According to the above technical solution, the two microlens arrays arranged at the forefront along the exit light path of the collimation module are symmetrically distributed relative to the first central axis, which can enable each of the multiple sub-beams of light obtained by splitting the collimated light by the microlens array at the forefront to enter the lenses in the microlens array for spherical aberration compensation of each sub-beam of light one by one. This helps to ensure that the second microlens array can better perform spherical aberration compensation on the light spot emitted by the first microlens array, so as to improve the quality of the sub-beams of light. At the same time, by making the lenses in each microlens array symmetrically distributed relative to the second central axis, it helps to ensure that multiple light spots are symmetrically superimposed at the target illumination part, forming an illumination field with a uniform light intensity distribution.

[0079] Exemplarily, the lens curvatures between each of the microlens arrays except the microlens array arranged at the forefront along the exit light path of the collimation module are different.

[0080] It can be understood that different lens curvatures have different spherical aberration compensation effects. Optionally, the lens curvatures of each of the microlens arrays except the first microlens array can decrease along the direction of the target collimated light. Alternatively, the lens curvatures of each of the microlens arrays except the first microlens array can increase along the direction of the target collimated light. In this example, by performing different spherical aberration compensations on the light spots in sequence with increasing or decreasing lens curvatures, it helps to further improve the uniformity of the light intensity in the illumination field.

[0081] In summary, it can also be understood that the endoscope illumination system provided in this application can be fully integrated into the endoscope, that is, the endoscope can include at least one light source, a collimation module, a light homogenizing member, and a plurality of light transmitting members as described above.

[0082] Alternatively, in some other embodiments, each component included in the endoscope illumination system can also be arranged in different devices.

[0083] Based on this, according to another aspect of the present application, an endoscope illumination device is further provided for connecting with an endoscope. The endoscope includes a plurality of light transmission members as described above. The endoscope illumination device includes: at least one light source, a collimation module, and a light homogenizing member; the collimation module includes at least one collimation lens group for receiving the emitted light rays of at least one light source and forming collimated light rays; the light homogenizing member includes at least two microlens arrays arranged in sequence along the emission optical path of the collimation module, and the number of lenses in each microlens array among the at least two microlens arrays is the same, so as to divide the collimated light rays into multiple sub-light rays and make the light intensity of each emitted sub-light ray evenly distributed at various angles; when the endoscope illumination device is connected to the endoscope, at least part of the lenses in the microlens array arranged at the rearmost along the emission optical path of the collimation module in the light homogenizing member are coupled to the incident end faces of the plurality of light transmission members one by one, so that the multiple sub-light rays emitted from at least part of the lenses are respectively transmitted to the target illumination area through the corresponding light transmission members and superimposed to form an illumination field at the target illumination area.

[0084] Wherein, for the specific implementation manners of the at least one light source, the collimation module, and the light homogenizing member, reference can be made to the relevant descriptions in the foregoing text, and details will not be elaborated here.

[0085] According to still another aspect of the present application, an endoscope is provided for connecting with an endoscope illumination device, and the endoscope illumination device adopts the endoscope illumination device described above; the endoscope includes: a plurality of light transmission members. When the endoscope is connected to the endoscope illumination device, the incident end faces of the plurality of light transmission members are coupled to at least part of the lenses in the microlens array arranged at the rearmost along the emission optical path of the collimation module in the light homogenizing member one by one, so that the multiple sub-light rays emitted from at least part of the lenses are respectively transmitted to the target illumination area through the corresponding light transmission members and superimposed to form an illumination field at the target illumination area. The endoscope described herein can be any type of endoscope, including but not limited to a gastroscope, a colonoscope, etc.

[0086] Exemplarily, the light transmission member is an optical fiber; the light-emitting sections of the plurality of optical fibers are integrated to form at least one optical fiber bundle. The specific implementation manner of this solution has been described in detail above and will not be elaborated.

[0087] Exemplarily, the endoscope further includes a fixing bracket; a plurality of mounting holes corresponding to at least part of the lenses one by one are provided on the fixing bracket; the light-incident ends of the plurality of light transmission members are respectively fixed in the plurality of mounting holes, so that when the endoscope is connected to the endoscope illumination device, the multiple sub-light rays emitted from at least part of the lenses are respectively transmitted to the target illumination area through the corresponding light transmission members.

[0088] According to yet another aspect of the present application, an endoscope system is provided, including the above-mentioned endoscope illumination device and / or the above-mentioned endoscope, or including the above-mentioned endoscope illumination system.

[0089] Those of ordinary skill in the art can understand the specific implementation solutions of the above endoscopic lighting device, endoscope, and endoscopic system by reading the above description of the endoscopic lighting system. For the sake of brevity, they will not be elaborated here.

[0090] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application thereto. Those of ordinary skill in the art can make various changes and modifications therein without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed by the appended claims.

[0091] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present application.

[0092] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0093] In the specification provided herein, a large number of specific details are set forth. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and technologies have not been shown in detail so as not to obscure the understanding of this specification.

[0094] Similarly, it should be understood that, in order to streamline the present application and assist in understanding one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be construed as reflecting the intention that the claimed present application requires more features than those expressly recited in each claim. Rather, as reflected by the corresponding claims, the inventive point lies in that the corresponding technical problems can be solved by features fewer than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, where each claim itself serves as a separate embodiment of the present application.

[0095] Those skilled in the art will understand that, except where features are mutually exclusive, any combination can be adopted to combine all the features disclosed in this specification (including the accompanying claims, abstract, and drawings), as well as all the processes or units of any method or device so disclosed. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) can be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0096] In addition, those skilled in the art will be able to understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of this application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0097] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim listing several devices, several of these devices can be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names.

[0098] As described above, this is only the specific implementation manner of the present application or an illustration of the specific implementation manner, and the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all such changes or substitutions should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An endoscope lighting device for connection with an endoscope, characterized in that, The endoscope includes a plurality of light transmission members, and the endoscope lighting device includes: at least one light source, a collimation module, and a light homogenizing member; The collimation module includes at least one collimation lens group for receiving the outgoing light rays of the at least one light source and forming collimated light rays; The light homogenizing member includes at least two microlens arrays arranged in sequence along the outgoing light path of the collimation module, and the number of lenses in each microlens array of the at least two microlens arrays is the same, so as to divide the collimated light rays into multiple sub-light rays and make the light intensity of each outgoing sub-light ray uniformly distributed at various angles; When the endoscope lighting device is connected to the endoscope, at least some of the lenses in the microlens array arranged at the rearmost along the outgoing light path of the collimation module in the light homogenizing member are coupled to the incident end faces of the plurality of light transmission members one by one, so that the multiple sub-light rays emitted from the at least some of the lenses are respectively transmitted to the target illumination site via the corresponding light transmission members and form an illumination field by superposition at the target illumination site.

2. The endoscopic lighting device according to claim 1, characterized in that, The shape of the projection of the lenses in each microlens array of the at least two microlens arrays on the projection plane is a rectangle or a regular hexagon, and the projection plane is a plane perpendicular to the outgoing light path of the collimation module.

3. The endoscopic lighting device according to claim 2, wherein The light homogenizing member includes two microlens arrays, and the two microlens arrays are symmetrically distributed with respect to the first central axis, and the first central axis is perpendicular to the outgoing light path of the collimation module; The shape of the projection of the lenses in each microlens array of the two microlens arrays on the projection plane is a rectangle; the distance d between the lowest points of the lens surfaces of any one of the two microlens arrays and the lowest points of the lens surfaces of the other microlens array in the target direction satisfies the following requirements: 0.9 ≤ 2*d*tanA / a ≤ 1.1; 0.9 ≤ 2*d*tanB / b ≤ 1.1; wherein, a is the length of the rectangle; b is the width of the rectangle; A represents the maximum outgoing angle of the sub-light rays in the horizontal direction; B represents the maximum outgoing angle of the sub-light rays in the vertical direction; the target direction is the direction parallel to the outgoing light path of the collimation module.

4. The endoscopic lighting device according to claim 2, characterized in that, The light homogenizing member includes two microlens arrays, and the two microlens arrays are symmetrically distributed with respect to the first central axis, and the first central axis is perpendicular to the outgoing light path of the collimation module; The shape of the projection of the lenses in each microlens array of the two microlens arrays on the projection plane is a regular hexagon; the distance d between the lowest points of the lens surfaces of any one of the two microlens arrays and the lowest points of the lens surfaces of the other microlens array in the target direction satisfies the following requirements: 0.9 ≤ 2*d*tanC / c ≤ 1.1; wherein, c is the side length of the regular hexagon; C represents the maximum outgoing angle of the sub-light rays; the target direction is the direction parallel to the outgoing light path of the collimation module.

5. The endoscopic lighting device according to any one of claims 1-4, characterized in that, When the endoscopic lighting device is connected to the endoscope, the distance between the microlens array arranged at the rearmost along the exit optical path of the collimation module in the light homogenizing member and the incident end faces of the plurality of light transmitting members is less than or equal to a preset distance, so that all of the multiple sub-beams of light emitted from at least part of the lenses enter the incident end faces of the plurality of light transmitting members.

6. The endoscopic lighting device according to any one of claims 1-4, characterized in that, The at least two microlens arrays are arranged in sequence along the exit optical path of the collimation module, and the two microlens arrays arranged at the foremost along the exit optical path of the collimation module are symmetrically distributed with respect to the first central axis. The lenses in each microlens array of the at least two microlens arrays are symmetrically distributed with respect to the second central axis. The first central axis is perpendicular to the exit optical path of the collimation module, and the second central axis is parallel to the exit optical path of the collimation module.

7. The endoscopic lighting device according to any one of claims 1-4, characterized in that, The lens curvatures between the microlens arrays of the at least two microlens arrays, except for the microlens array arranged at the foremost along the exit optical path of the collimation module, are different.

8. An endoscope for connection to an endoscope lighting device, characterized in that, The endoscopic lighting device is the endoscopic lighting device according to any one of claims 1-7; the endoscope includes: a plurality of light transmitting members. When the endoscope is connected to the endoscopic lighting device, the incident end faces of the plurality of light transmitting members are respectively coupled to at least part of the lenses in the microlens array arranged at the rearmost along the exit optical path of the collimation module in the light homogenizing member, so that the multiple sub-beams of light emitted from at least part of the lenses are respectively transmitted to the target illumination site through the corresponding light transmitting members and form an illumination field by superposition at the target illumination site.

9. The endoscope according to claim 8, characterized in that, The light transmitting member is an optical fiber; the light emitting sections of the plurality of optical fibers are integrated to form at least one optical fiber bundle.

10. The endoscope according to claim 8, characterized in that, It further includes a fixing bracket; a plurality of mounting holes corresponding to at least part of the lenses one by one are arranged on the fixing bracket; the incident ends of the plurality of light transmitting members are respectively fixed in the plurality of mounting holes, so that when the endoscope is connected to the endoscopic lighting device, the multiple sub-beams of light emitted from at least part of the lenses are respectively transmitted to the target illumination site through the corresponding light transmitting members.

11. An endoscope illumination system, characterized in that, Comprising: At least one light source, a collimation module, a light homogenizing member and a plurality of light transmitting members; The collimation module includes at least one collimation lens group for receiving the emitted light of the at least one light source and forming collimated light; The light homogenizing member includes at least two microlens arrays arranged in sequence along the exit optical path of the collimation module. The number of lenses in each microlens array of the at least two microlens arrays is the same, so as to divide the collimated light into multiple sub-beams of light and make the light intensity of each emitted sub-beam of light uniform in each angle; At least part of the lenses in the microlens array arranged at the rearmost along the exit optical path of the collimation module in the light homogenizing member are respectively coupled to the incident end faces of the plurality of light transmitting members, so that the multiple sub-beams of light emitted from at least part of the lenses are respectively transmitted to the target illumination site through the corresponding light transmitting members and form an illumination field by superposition at the target illumination site.

12. An endoscope system, characterized in that, Comprising the endoscope illumination device according to any one of claims 1-7 and / or the endoscope according to any one of claims 8-10, or comprising the endoscope illumination system according to claim 11.

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