Objective lens end structure and endoscope

Abstract

The utility model relates to an objective lens end structure and an endoscope. The objective lens end structure comprises a spacing tube, a first accommodating channel is arranged along the axial direction in a penetrating manner, and two ends of the spacing tube along the axial direction are respectively a first connecting end and a second connecting end; the first objective lens group is provided with a first insertion part and a first limiting part which are connected; wherein the first inserting part is inserted into the first accommodating channel from the first connecting end, and a first gap is formed between the first inserting part and the inner wall of the first accommodating channel; the first limiting part is arranged on one side of the first connecting end, and the end face of the side facing the interval pipe is connected with the end face of the first connecting end. Therefore, according to the objective lens end structure and the endoscope provided by the invention, the position of the first insertion part in the first accommodating channel along the radial direction of the spacing tube can be adjusted, so that the contact ratio of the center of the first objective lens group and the center of the spacing tube is relatively high, and the adverse effect of the objective lens group on the imaging quality can be reduced.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to objective lens structures and endoscopes. Background Technology

[0002] An endoscope is a diagnostic instrument that integrates optical, electronic, and software technologies. It enters the body through natural orifices or minimally invasive openings to reach the location of the lesion to be examined, so as to perform real-time dynamic imaging monitoring of the lesion.

[0003] In related technologies, the lens assembly of an endoscope includes an objective lens assembly for imaging, a rod lens assembly for transmitting image information, and an eyepiece assembly for presenting image information.

[0004] However, adjusting the center coincidence of each lens in the aforementioned objective lens assembly is somewhat difficult, resulting in a low center coincidence of each lens, which adversely affects the imaging quality of the endoscope. Utility Model Content

[0005] Therefore, it is necessary to provide an objective lens end structure and endoscope that can reduce the adverse effects of the objective lens assembly on image quality.

[0006] In a first aspect, embodiments of this application provide an objective lens end structure, comprising: a spacer tube having a first accommodating channel extending through it along an axial direction, the two ends of the spacer tube along the axial direction being a first connecting end and a second connecting end, respectively; a first objective lens assembly having a first insertion portion and a first limiting portion connected together; wherein the first insertion portion is inserted into the first accommodating channel from the first connecting end and has a first gap between it and the inner wall of the first accommodating channel, so that the radial position between the first objective lens assembly and the spacer tube is adjustable; the first limiting portion is disposed on one side of the first connecting end, and the end face facing the spacer tube is connected to the end face of the first connecting end.

[0007] The objective lens end structure provided in this application embodiment is inserted into the first receiving channel of the first connecting end via a first insertion part, and has a first gap between the insertion part and the inner wall of the first receiving channel. A first limiting part is disposed on the side of the first connecting end away from the second connecting end, and the surface of the first limiting part facing the spacer tube is connected to the surface of the first connecting end facing the first limiting part. Therefore, before the first objective lens group and the spacer tube are connected, the first gap allows adjustment of the radial position of the first insertion part along the spacer tube in the first receiving channel, resulting in a high degree of overlap between the center of the first objective lens group and the center of the spacer tube, thereby reducing the adverse effects of the objective lens group on image quality. After the first objective lens group and the spacer tube are connected, a fixed connection can fix the relative positional relationship between the first objective lens group and the spacer tube, preventing misalignment between the center of the first objective lens group and the center of the spacer tube, ensuring that the center of the first objective lens group and the center of the spacer tube always have a high degree of overlap.

[0008] In one embodiment, the objective lens end structure includes a second objective lens group, which has a connected second insertion portion and a second limiting portion. The second insertion portion is inserted into the first receiving channel from the second connecting end and has a second gap with the inner wall of the first receiving channel, so that the radial position between the second objective lens group and the spacer tube is adjustable. The second limiting portion is disposed on one side of the second connecting end, and the end face facing the spacer tube is connected to the end face of the second connecting end.

[0009] In one embodiment, the objective lens end structure includes a first adhesive member disposed between the end face of the first limiting portion facing the spacer tube and the end face of the first connecting end.

[0010] And / or, the objective lens end structure includes a second adhesive member disposed between the end face of the second limiting portion facing the spacer tube and the end face of the second connecting end.

[0011] In one embodiment, the end face of the first limiting part facing the spacer tube is a first surface, and the end face of the first connecting end is a second surface; the end face of the second limiting part facing the spacer tube is a third surface, and the end face of the second connecting end is a fourth surface.

[0012] The flatness of at least one of the first, second, third, and fourth surfaces is less than or equal to 0.01 mm;

[0013] And / or, the first objective lens group has a first centerline extending along the axial direction, and the perpendicularity between the first centerline and the first surface is less than or equal to 0.01 mm;

[0014] And / or, the second objective lens group has a second centerline extending along the axial direction, and the perpendicularity between the second centerline and the third surface is less than or equal to 0.01 mm;

[0015] And / or, the spacer tube has a third centerline extending axially, and the perpendicularity between at least one of the second and fourth surfaces and the third centerline is less than or equal to 0.01 mm.

[0016] In one embodiment, the objective lens end structure includes a lens tube, in which a second receiving channel is provided, the second receiving channel extending axially through the lens tube;

[0017] The second receiving channel includes a first sub-channel and a second sub-channel that are connected and arranged axially. The opening size of the first sub-channel is larger than the opening size of the second sub-channel. The portion of the endoscope tube in the second sub-channel facing the first sub-channel is configured as a first limiting surface.

[0018] The first insertion part, the spacer tube, and the second objective lens group are all disposed in the second sub-channel, and the first limiting part is disposed in the first sub-channel. The surface of the first limiting part facing the first insertion part abuts against the first limiting surface.

[0019] In one embodiment, the spacer tube includes a middle section located between the first connecting end and the second connecting end, and the outer wall of the middle section is provided with an exhaust port, which communicates with the first accommodating channel.

[0020] In one embodiment, the distance between the exhaust port and the end face of the first connection end is greater than the distance between the exhaust port and the end face of the second connection end.

[0021] In one embodiment, the objective lens end structure includes a third adhesive member disposed on the circumferential outer surface of the spacer tube and between the exhaust port and the end face of the first connection end.

[0022] Secondly, embodiments of this application provide an endoscope, including: an endoscope body and the objective lens end structure mentioned in the first aspect above, the endoscope body being provided with a third receiving channel, the third receiving channel extending axially through at least a portion of the endoscope body, and the objective lens end structure being disposed in the third receiving channel.

[0023] In one embodiment, the first objective lens group of the objective lens end structure includes a third insertion portion, which is disposed on the side of the first limiting portion of the first objective lens group away from the first insertion portion of the first objective lens group.

[0024] The third receiving channel includes a third sub-channel and a fourth sub-channel that are connected and arranged axially. The opening size of the third sub-channel is smaller than that of the fourth sub-channel. A portion of the endoscope body in the third sub-channel facing the fourth sub-channel is configured as a second limiting surface. The third insertion part is disposed in the third sub-channel, and the remaining part of the objective lens end structure is disposed in the fourth sub-channel. At least one of the surface of the first limiting part facing away from the first insertion part and the end face of the end tube of the objective lens end structure abuts against the second limiting surface. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the objective lens end structure provided in an embodiment of this application.

[0026] Figure 2 A partial exploded view of the endoscope provided in the embodiments of this application.

[0027] Figure 3 A partial cross-sectional view of an endoscope provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Endoscope; 100. Objective lens end structure; 110. First objective lens group; 110a. First insertion part; 110b. First limiting part; 110c. Third insertion part; 111. First surface; 120. Second objective lens group; 120a. Second insertion part; 120b. Second limiting part; 123. Third surface; 130. Spacing tube; 130a. First connecting end; 130b. Second connecting end; 130 c. Middle section; 131. First receiving channel; 132. Second surface; 134. Fourth surface; 135. Exhaust port; 140. Endoscope tube; 141. First limiting surface; 42. Second receiving channel; 1421. First sub-channel; 1422. Second sub-channel; 200. Endoscope body; 220. Second limiting surface; 230. Third receiving channel; 233. Third sub-channel; 234. Fourth sub-channel. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0036] In related technologies, an endoscope may include an objective lens assembly for imaging, a rod lens assembly for transmitting image information, and an eyepiece assembly for presenting image information. The objective lens end structure may include an objective lens tube, an objective lens assembly, and a spacer tube, wherein the objective lens assembly includes a first objective lens group and a second objective lens group, the first objective lens group, the second objective lens group, and the spacer tube are all disposed in the objective lens tube, and the spacer tube is located between the first objective lens group and the second objective lens group to separate the first objective lens group and the second objective lens group.

[0037] When assembling the objective lens end structure, the first objective lens group can be bonded to the objective lens tube to achieve axial positioning of the first objective lens group. Subsequently, the spacer tube and the second objective lens group are placed into the objective lens tube in sequence.

[0038] However, after placing the first objective lens group, the second objective lens group, and the spacer tube in the objective lens tube, it is impossible to adjust the center alignment of the first objective lens group and the second objective lens group. Furthermore, the center alignment of the first objective lens group and the second objective lens group is affected by factors such as the radius of curvature of the first objective lens group and the second objective lens group, the dimensional tolerance of the spacer tube, and the tolerance of the objective lens tube. This results in poor center alignment between the first objective lens group and the spacer tube, and poor center alignment between the second objective lens group and the spacer tube. Consequently, the center alignment of the first objective lens group and the second objective lens group is also poor, which adversely affects the imaging quality of the endoscope. In addition, the poor consistency between different batches of endoscopes leads to low repeatability of the first objective lens group and the second objective lens group, which further adversely affects the imaging quality of the endoscope.

[0039] To address the aforementioned issues, embodiments of this application provide an objective lens end structure and an endoscope that can reduce the adverse effects of the objective lens assembly on image quality.

[0040] The following will combine Figures 1-3 The objective lens end structure 100 and endoscope 10 provided in the embodiments of this application will be described.

[0041] See Figure 1 This application provides an objective lens end structure 100, which may include a spacer tube 130. The spacer tube 130 is provided with a first receiving channel 131. The first receiving channel 131 passes through the spacer tube 130 along the axial direction A. The two ends of the spacer tube 130 along the axial direction A are a first connecting end 130a and a second connecting end 130b, respectively.

[0042] See Figure 1 The objective lens end structure 100 may include a first objective lens assembly 110. The first objective lens assembly 110 has a connected first insertion portion 110a and a first limiting portion 110b. The first insertion portion 110a is inserted into the first receiving channel 131 from the first connecting end 130a, and there is a first gap between the first insertion portion 110a and the inner wall of the first receiving channel 131, so that the radial position between the first objective lens assembly 110 and the spacer tube 130 is adjustable. By setting the first gap, before the first objective lens assembly 110 and the spacer tube 130 are connected, the first insertion portion 110a can be adjusted along the first receiving channel 131. The radial position of the spacer tube 130 allows for a high degree of overlap between the center of the first objective lens group 110 and the center of the spacer tube 130, thereby reducing the adverse effects of the objective lens group on image quality. In addition, in different batches of endoscopes 10, the radial position of the first insertion part 110a in the first receiving channel 131 along the spacer tube 130 can be adjusted to ensure a high degree of overlap between the center of the first objective lens group 110 and the center of the corresponding spacer tube 130, thereby increasing the repeatability and adjustment accuracy of the first objective lens group 110 and the corresponding spacer tube 130, and thus improving the image quality of the endoscope 10.

[0043] For example, the first limiting part 110b is disposed on the side of the first connecting end 130a opposite to the second connecting end 130b. The first limiting part 110b is located outside the spacer tube 130. The dimension of the first insertion part 110a perpendicular to the axial direction A (radial direction of the spacer tube 130) is smaller than the dimension of the first limiting part 110b perpendicular to the axial direction A. The surface (i.e., end face) of the first limiting part 110b facing the spacer tube 130 is connected to the surface (i.e., end face) of the first connecting end 130a facing the first limiting part 110b. After the first objective lens group 110 and the spacer tube 130 are connected, the relative positional relationship between the first objective lens group 110 and the spacer tube 130 can be fixed to prevent the center of the first objective lens group 110 from being misaligned with the center of the spacer tube 130, so that the center of the first objective lens group 110 and the center of the spacer tube 130 always have a high degree of overlap.

[0044] See Figure 1 In some embodiments, the objective lens end structure 100 includes a second objective lens group 120. The second objective lens group 120 has a connected second insertion portion 120a and a second limiting portion 120b. The second insertion portion 120a is inserted into the first receiving channel 131 from the second connecting end 130b, and a second gap exists between the second insertion portion 120a and the inner wall of the first receiving channel 131, so that the radial position between the second objective lens group 120 and the spacer tube 130 is adjustable. By setting the second gap, before the second objective lens group 120 and the spacer tube 130 are connected, the second insertion portion 120a can be adjusted in the first receiving channel 131. The radial position of the second insertion part 120a along the spacer tube 130 in the first receiving channel 131 can make the center of the first objective lens group 110 and the second objective lens group 120 more coincident, thereby reducing the adverse effect of the objective lens group on the imaging quality. In addition, in different batches of endoscopes 10, the radial position of the second insertion part 120a along the spacer tube 130 in the first receiving channel 131 can be adjusted so that the center of the second objective lens group 120 in different batches coincides with the center of the corresponding spacer tube 130. This results in a higher repeatability of the second objective lens group 120 and the corresponding spacer tube 130 in different batches, thereby improving the imaging quality of the endoscope 10.

[0045] For example, see Figure 1The second limiting part 120b is disposed on the side of the second connecting end 130b opposite to the first connecting end 130a. The second limiting part 120b is located outside the spacer tube 130. The dimension of the second insertion part 120a perpendicular to the axial direction A is smaller than the dimension of the second limiting part 120b perpendicular to the axial direction A. The surface (i.e., end face) of the second limiting part 120b facing the spacer tube 130 is connected (i.e., end face) to the surface (i.e., end face) of the second connecting end 130b facing the second limiting part 120b. This allows the relative positional relationship between the second objective lens group 120 and the spacer tube 130 to be fixed, preventing the center of the second objective lens group 120 from being misaligned with the center of the spacer tube 130, and ensuring that the center of the second objective lens group 120 and the center of the spacer tube 130 always have a high degree of overlap.

[0046] In some embodiments, the objective end structure 100 includes a first adhesive member disposed between the surface (i.e., end face) of the first limiting portion 110b facing the spacer tube 130 and the surface (i.e., end face) of the first connecting end 130a facing the first limiting portion 110b, that is, the first adhesive member is disposed between the first surface 111 and the second surface 132. In this way, the spacer tube 130 and the first objective lens group 110 are connected by the first adhesive member, which helps to reduce the difficulty of connecting the spacer tube 130 and the first objective lens group 110.

[0047] In some embodiments, the objective end structure 100 includes a second adhesive member disposed between the surface (i.e., end face) of the second limiting portion 120b facing the spacer tube 130 and the surface (i.e., end face) of the second connecting end 130b facing the second limiting portion 120b, that is, the second adhesive member is disposed between the third surface 123 and the fourth surface 134. In this way, the spacer tube 130 and the second objective lens group 120 are connected by the second adhesive member, which helps to reduce the difficulty of connecting the spacer tube 130 and the second objective lens group 120.

[0048] In some embodiments, see Figure 1 The surface (i.e. end face) of the first limiting part 110b facing the spacer tube 130 is the first surface 111, the surface (i.e. end face) of the first connecting end 130a facing the first limiting part 110b is the second surface 132, the surface (i.e. end face) of the second limiting part 120b facing the spacer tube 130 is the third surface 123, and the surface (i.e. end face) of the second connecting end 130b facing the second limiting part 120b is the fourth surface 134.

[0049] For example, the flatness of at least one of the first surface 111, the second surface 132, the third surface 123, and the fourth surface 134 is less than or equal to 0.01 mm. For instance, the flatness of the first surface 111, the second surface 132, the third surface 123, and the fourth surface 134 is all less than or equal to 0.01 mm, so that the first surface 111 and the second surface 132 can fit together well, which is beneficial to improving the center coincidence of the first objective lens group 110 and the center coincidence of the spacer tube 130. In addition, the third surface 123 and the fourth surface 134 can fit together well, which is beneficial to improving the center coincidence of the second objective lens group 120 and the center coincidence of the spacer tube 130.

[0050] For example, the flatness can be any value of 0.001mm, 0.002mm, 0.005mm, 0.008mm, 0.01mm or less than 0.01mm.

[0051] In some embodiments, the first objective lens group 110 has a first center line extending along the axial direction A, and the perpendicularity between the first center line and the first surface 111 is less than or equal to 0.01 mm, thereby improving the coincidence of the center of the first objective lens group 110 and the center of the spacer tube 130.

[0052] In some embodiments, the second objective lens group 120 has a second centerline extending along the axial direction A, and the perpendicularity between the second centerline and the third surface 123 is less than or equal to 0.01 mm, thereby improving the coincidence of the center of the second objective lens group 120 and the center of the spacer tube 130.

[0053] In some embodiments, the spacer tube 130 has a third centerline extending along the axial direction A, and the perpendicularity between at least one of the second surface 132 and the fourth surface 134 and the third centerline is less than or equal to 0.01 mm. For example, the perpendicularity between the second surface 132 and the fourth surface 134 and the third centerline is less than or equal to 0.01 mm, which helps to improve the coincidence of the center of the first objective lens group 110 and the center of the spacer tube 130, as well as the coincidence of the center of the second objective lens group 120 and the center of the spacer tube 130, thereby improving the coincidence of the center of the first objective lens group 110 and the center of the second objective lens group 120.

[0054] For example, the verticality can be any value of 0.001mm, 0.002mm, 0.005mm, 0.008mm, 0.01mm or less than 0.01mm.

[0055] The center of the first objective lens group 110 coincides with the center of the spacer tube 130, which can mean that the first center line and the third center line are collinear. The center of the second objective lens group 120 coincides with the center of the spacer tube 130, which can mean that the second center line and the third center line are collinear. The coincidence of the center of the first objective lens group 110 and the center of the second objective lens group 120 can mean that the first center line and the second center line are collinear.

[0056] In some embodiments, see Figure 2 and Figure 3 The objective lens end structure 100 includes a tube 140, in which a second receiving channel 142 is provided. The second receiving channel 142 extends through the tube 140 along the axial direction A. The spacer tube 130, at least a portion of the first objective lens group 110, and the second objective lens group 120 can all be disposed in the second receiving channel 142. The function of the tube 140 is to install the assembled first objective lens group 110, second objective lens group 120, and spacer tube 130. The tube 140 can also install other lenses (e.g., rod lenses and / or eyepieces). By adjusting the tube 140, the direction of the first objective lens group 110 can be adjusted so that the first objective lens group 110 coincides with the viewing angle direction of the endoscope body 200.

[0057] For example, see Figure 3 The second receiving channel 142 includes a first sub-channel 1421 and a second sub-channel 1422 that are connected. The first sub-channel 1421 and the second sub-channel 1422 are arranged along the axial direction A. The opening size of the first sub-channel 1421 is larger than the opening size of the second sub-channel 1422. A portion of the surface of the lens tube 140 in the second sub-channel 1422 facing the first sub-channel 1421 is configured as a first limiting surface 141. The first insertion part 110a, the spacer tube 130, and the second objective lens group 120 are all disposed in the second sub-channel 1422. The first limiting part 110b is disposed in the first sub-channel 1421. The surface of the first limiting part 110b facing the first insertion part 110a abuts against the first limiting surface 141. Thus, by abutting the first limiting part 110b and the first limiting surface 141, the position of the first objective lens group 110 in the lens tube 140 can be restricted, thereby restricting the position of the assembled first objective lens group 110, the spacer tube 130 and the second objective lens group 120 in the spacer tube 130.

[0058] In some embodiments, see Figure 1 and Figure 2The spacer tube 130 includes a middle section 130c located between the first connecting end 130a and the second connecting end 130b. The outer wall surface of the middle section 130c is provided with an exhaust port 135, which communicates with the first receiving channel 131. Thus, by providing the exhaust port 135, during the assembly of the first objective lens group 110 and the second objective lens group 120, the gas in the spacer tube 130 can be discharged through the exhaust port 135 to prevent the presence of gas in the spacer tube 130 from causing a pressure difference between the inside and outside of the spacer tube 130. This can prevent the first objective lens group 110 and / or the second objective lens group 120 from being improperly installed due to the pressure difference, thereby improving the imaging quality of the endoscope 10.

[0059] For example, the exhaust port 135 may be circular, polygonal, elliptical or other shapes.

[0060] For example, see Figure 2 The exhaust port 135 can be strip-shaped and extends circumferentially along the spacer tube 130, which makes the extension length of the exhaust port 135 larger, which is beneficial for exhaust. It also makes the width of the exhaust port 135 smaller, which is beneficial for reducing the adverse effects of the exhaust port 135 on the mechanical strength of the spacer tube 130.

[0061] For example, see Figure 1 As shown in the figure, the assembly process of the objective lens end structure 100 can be as follows: the first insertion part 110a of the first objective lens group 110 is inserted into the first connecting end 130a of the spacer tube 130. The first objective lens group 110 is positioned axially A by contact between the first surface 111 and the second surface 132. Then, the radial position of the first objective lens group 110 relative to the spacer tube 130 is adjusted so that the center of the first objective lens group 110 coincides with that of the spacer tube 130. At this time, glue is dripped onto the first surface 111 and the second surface 132 to make the first objective lens group 110 and the spacer tube 130... 30 is fixed. Then, the second insertion part 120a of the second objective lens group 120 is inserted into the spacer tube 130 from the second connecting end 130b of the spacer tube 130. The second objective lens group 120 is positioned axially A through contact between the third surface 123 and the fourth surface 134. The radial position of the second objective lens group 120 relative to the spacer tube 130 is then adjusted so that the center of the second objective lens group 120 coincides with that of the spacer tube 130. At this time, glue is dripped onto the third surface 123 and the fourth surface 134 to fix the second objective lens group 120 and the spacer tube 130. When assembling the second objective lens group 120, the air in the spacer tube 130 will be discharged through the exhaust port 135, so that the second objective lens group 120 can be smoothly assembled into place. The assembled first objective lens group 110, second objective lens group 120 and spacer tube 130 are placed into the lens tube 140, through the first surface 111 and the first limiting surface 141 ( Figure 3 ( ) Contact, to achieve axial A-fixation of the lens tube 140 and the first objective lens group 110.

[0062] In some embodiments, the objective end structure 100 includes a third adhesive member disposed on the circumferential outer surface of the spacer tube 130. The third adhesive member may be located between the spacer tube 130 and the lens tube 140, thereby connecting the spacer tube 130 and the lens tube 140. This allows the assembled first objective lens group 110, second objective lens group 120, and spacer tube 130 to be fixed to the lens tube 140, so that the first objective lens group 110 can be moved by operating the lens tube 140.

[0063] For example, at least one of the first adhesive, the second adhesive, and the third adhesive may be a thermosetting adhesive, and before curing, at least one of the first adhesive, the second adhesive, and the third adhesive may have a certain degree of fluidity.

[0064] The first objective lens group 110, the second objective lens group 120, and the spacer tube 130 are assembled to form a complete assembly. When assembling this assembly onto the lens tube 140, it can be inserted through the opening of the first sub-channel 1421. The assembly moves along the direction from the first sub-channel 1421 to the second sub-channel 1422. The third adhesive on the outer surface of the assembly is not cured and has a certain degree of fluidity, causing part of the third adhesive to be moved by the inner wall of the lens tube 140 towards the direction from the second sub-channel 1422 to the first sub-channel 1421. By placing the third adhesive between the vent 135 and the surface of the first connecting end 130a facing away from the second connecting end 130b, the third adhesive will not enter the vent 135 during movement, and thus will not enter the spacer tube 130, preventing the third adhesive from affecting the imaging quality.

[0065] In some embodiments, see Figure 1 The distance D1 between the exhaust port 135 and the surface of the first connecting end 130a facing away from the second connecting end 130b is greater than the distance D2 between the exhaust port 135 and the surface of the second connecting end 130b facing away from the first connecting end 130a. This results in a larger distance between the exhaust port 135 and the surface of the first connecting end 130a facing away from the second connecting end 130b, allowing for the placement of more third adhesive components. This improves the connection stability between the spacer tube 130 and the mirror tube 140 and also increases the flexibility in setting the third adhesive components.

[0066] In other embodiments, the distance D1 between the exhaust port 135 and the surface of the first connecting end 130a facing away from the second connecting end 130b can be less than or equal to the distance D2 between the exhaust port 135 and the surface of the second connecting end 130b facing away from the first connecting end 130a. This application does not limit the relationship between the magnitudes of distances D1 and D2.

[0067] In some embodiments, see Figure 3 The first objective lens group 110 includes a third insertion portion 110c, which is disposed on the side of the first limiting portion 110b opposite to the first insertion portion 110a. The third insertion portion 110c can be located outside the lens tube 140. The dimension of the third insertion portion 110c along the vertical axis A is smaller than the dimension of the first limiting portion 110b along the vertical axis A.

[0068] The endoscope 10 provided in the embodiments of this application will be described below.

[0069] See Figure 2 and Figure 3 This application provides an endoscope 10, which includes an endoscope body 200 and an objective lens end structure 100 as described in the above embodiment. The endoscope body 200 is provided with a third receiving channel 230, which extends through at least a portion of the endoscope body 200 along the axial direction A of the objective lens end structure 100. The objective lens end structure 100 is disposed in the third receiving channel 230, and the endoscope body 200 can protect the objective lens end structure 100.

[0070] For example, see Figure 3 The third receiving channel 230 includes a connected third sub-channel 233 and a fourth sub-channel 234, which are arranged along axis A. The opening size of the third sub-channel 233 is smaller than that of the fourth sub-channel 234. A portion of the surface of the endoscope body 200 at the third sub-channel 233 facing the fourth sub-channel 234 is configured as a second limiting surface 220. The third insertion part 110c is disposed in the third sub-channel 233. The remaining portion of the objective lens end structure 100... Partially disposed in the fourth sub-channel 234, the surface of the first limiting part 110b facing away from the first insertion part 110a abuts against the second limiting surface 220. Thus, during the process of inserting the assembled objective lens end structure 100 into the endoscope body 200, the axial A positioning of the objective lens end structure 100 and the endoscope body 200 is achieved through the abutment of the second limiting surface 220 and the first limiting part 110b. At this time, rotating the endoscope tube 140 can make the first objective lens group 110 coincide with the viewing angle of the endoscope body 200.

[0071] For example, the lens tube 140 includes a first end face located on the side of the first sub-channel 1421 opposite to the second sub-channel 1422. The first end face can abut against the second limiting surface 220, thereby increasing the contact area between the second limiting surface 220 and the objective lens end structure 100, which is beneficial to improving the contact stability between the second limiting surface 220 and the objective lens end structure 100. At least one of the first end face and the surface of the first limiting portion 110b opposite to the first insertion portion 110a can abut against the second limiting surface 220.

[0072] For example, endoscope 10 includes, but is not limited to, a laparoscope, an arthoscope, a neurosurgical endoscope, or other endoscopes.

[0073] The following describes the endoscope system provided in the embodiments of this application.

[0074] This application provides an endoscope system, which includes an endoscope 10, a light source, a camera, and a host. The endoscope 10 is connected to the light source via an optical fiber. The light source illuminates human tissue via the optical fiber. The endoscope 10 is used to acquire the light reflected from the human tissue and transmit the light signal to the camera. One end of the camera is connected to the endoscope 10, and the other end of the camera is connected to the host. The camera is used to convert the light signal transmitted by the endoscope 10 into an electrical signal and transmit the electrical signal to the host. The host is used to process the electrical signal and output an image.

[0075] For example, the light source can be white light or other colored light, and the light source is guided to the front end through optical fiber so as to be emitted as illumination light.

[0076] For example, the camera has a light sensor and a processor. The light sensor acquires the light emitted from the endoscope 10 and converts the light signal into an electrical signal. The processor amplifies, filters and performs other preprocessing on the electrical signal before sending it to the host.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An objective end structure, characterized by The objective end structure comprises a spacer tube, a first objective group, and a second objective group. The spacer tube is provided with a first accommodating channel along an axial direction, and two ends of the spacer tube along the axial direction are respectively a first connecting end and a second connecting end. The first objective group is formed with a first inserting part and a first limiting part connected to each other. The first inserting part is inserted into the first accommodating channel from the first connecting end and has a first gap between the first inserting part and an inner wall of the first accommodating channel, so that a radial position between the first objective group and the spacer tube is adjustable.

2. The objective end structure according to claim 1, characterized in that The first limiting part is arranged on one side of the first connecting end and an end surface of the first limiting part towards one side of the spacer tube is connected to an end surface of the first connecting end.

3. The objective end structure according to claim 2, characterized in that The objective end structure comprises a first adhesive arranged between the end surface of the first limiting part towards one side of the spacer tube and the end surface of the first connecting end. The objective end structure comprises a second adhesive arranged between the end surface of the second limiting part towards one side of the spacer tube and the end surface of the second connecting end.

4. The objective end structure according to claim 2 or 3, characterized in that The end surface of the first limiting part towards one side of the spacer tube is a first surface, and the end surface of the first connecting end is a second surface. The end surface of the second limiting part towards one side of the spacer tube is a third surface, and the end surface of the second connecting end is a fourth surface. A flatness of at least one of the first surface, the second surface, the third surface, and the fourth surface is less than or equal to 0.01 mm. The first objective group has a first center line extending along the axial direction, and a perpendicularity between the first center line and the first surface is less than or equal to 0.01 mm. The second objective group has a second center line extending along the axial direction, and a perpendicularity between the second center line and the third surface is less than or equal to 0.01 mm.

5. The objective end structure according to claim 2 or 3, characterized in that The spacer tube has a third center line extending along the axial direction, and a perpendicularity between at least one of the second surface and the fourth surface and the third center line is less than or equal to 0.01 mm. The objective end structure comprises a mirror tube, and the mirror tube is provided with a second accommodating channel penetrating the mirror tube along the axial direction. The second accommodating channel comprises a first sub-channel and a second sub-channel connected and arranged along the axial direction. An opening size of the first sub-channel is greater than an opening size of the second sub-channel, and a part surface of the mirror tube towards one side of the first sub-channel at the second sub-channel is configured as a first limiting surface. The first insertion portion, the spacer tube and the second objective lens group are arranged in the second sub-passage, and the first limiting portion is arranged in the first sub-passage, and a surface of the first limiting portion on a side facing the first insertion portion abuts against the first limiting surface.

6. The objective end structure according to claim 2 or 3, characterized in that The spacer tube comprises a middle section between the first connecting end and the second connecting end, and an outer wall surface of the middle section is provided with an exhaust port, and the exhaust port is in communication with the first accommodating passage.

7. The objective end structure according to claim 6, characterized in that The distance between the exhaust port and the end surface of the first connecting end is greater than the distance between the exhaust port and the end surface of the second connecting end.

8. The objective end structure according to claim 6, characterized in that The objective lens end structure comprises a third adhesive member, which is arranged on the outer surface of the spacer tube in the circumferential direction and between the exhaust port and the end surface of the first connecting end.

9. An endoscope characterized by comprising: The endoscope body and the objective lens end structure according to any one of claims 1-8 are provided, and the endoscope body is provided with a third accommodating passage, which penetrates at least part of the endoscope body in the axial direction, and the objective lens end structure is arranged in the third accommodating passage. The first objective lens group of the objective lens end structure comprises a third insertion portion, which is arranged on a side of the first limiting portion of the first objective lens group away from the first insertion portion of the first objective lens group; 10. The endoscope of claim 9, wherein, The third accommodating passage comprises a third sub-passage and a fourth sub-passage which are in communication and arranged in the axial direction, the opening size of the third sub-passage is smaller than that of the fourth sub-passage, a part of the surface of the endoscope body on a side of the third sub-passage facing the fourth sub-passage is configured as a second limiting surface, the third insertion portion is arranged in the third sub-passage, the remaining part of the objective lens end structure is arranged in the fourth sub-passage, and at least one of the surface of the first limiting portion on a side away from the first insertion portion and the end surface of the lens tube of the objective lens end structure abuts against the second limiting surface. ​

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