Screw structure for a lens barrel

Abstract

The present application relates to fastening device technical field, specifically to a kind of screw thread structure for lens barrel, including fixed shell, movable shell and screw thread assembly, one end of movable shell is arranged in the inside of fixed shell, screw thread assembly includes first screw thread barrel and second screw thread barrel, first screw thread barrel is detachably connected with fixed shell, second screw thread barrel is detachably connected with movable shell, first screw thread barrel is threadedly connected with second screw thread barrel, the inside of first screw thread barrel is provided with first thread, the outside of second screw thread barrel is provided with second thread compatible with first thread, when first thread or second thread is worn, first screw thread barrel or second screw thread barrel can be detached from fixed shell or movable shell, and new first screw thread barrel or second screw thread barrel is replaced, so that the first thread and second thread of first screw thread barrel and second screw thread barrel installed on fixed shell and movable shell can remain unworn state, to keep the precision of screw thread structure.

Description

Technical Field

[0001] This invention relates to the field of fastening device technology, and in particular to a threaded structure for a mirror barrel. Background Technology

[0002] Tube lenses are mostly used in conjunction with objective lenses inside a microscope. Together, they perfectly correct the aberrations of the objective lens. The tube generally includes a fixed housing and a movable housing. The movable housing is threadedly connected to the fixed housing to adjust their relative positions for focusing.

[0003] The threads of the microscope tube will wear down after prolonged use, making it impossible to accurately rotate, which will have a certain impact on the microscope tube. Summary of the Invention

[0004] The purpose of this invention is to provide a screw thread structure for a lens barrel that allows for the replacement of worn screw threads, thereby ensuring the rotational accuracy of the screw thread structure.

[0005] To achieve the above objectives, the present invention provides a threaded structure for an endoscope barrel, comprising a fixed housing, a movable housing, and a threaded assembly. One end of the movable housing is disposed inside the fixed housing. The threaded assembly includes a first threaded barrel and a second threaded barrel. The first threaded barrel is detachably connected to the fixed housing and is located inside the fixed housing. The second threaded barrel is detachably connected to the movable housing and is located outside the movable housing. The first threaded barrel and the second threaded barrel are threadedly connected. A first thread is formed on the inner side of the first threaded barrel, and a second thread is formed on the outer side of the second threaded barrel that matches the first thread.

[0006] Both the fixed housing and the movable housing are provided with mounting cavities. A connecting structure is provided inside the mounting cavity. A connecting port is provided on the outer side of the first threaded barrel and the inner side of the second threaded barrel. The connecting structure includes a first return spring and a connecting bracket. The first return spring is fixedly disposed inside the mounting cavity, and the connecting bracket is movably disposed inside the mounting cavity, with one end of the connecting bracket located inside the connecting port.

[0007] The first threaded cylinder has a strip-shaped limiting bracket on its outer side, and the inner side of the fixed housing has a strip-shaped limiting groove adapted to the strip-shaped limiting bracket, with the strip-shaped limiting bracket located inside the strip-shaped limiting groove.

[0008] The screw thread structure for the lens barrel further includes a first anti-rotation structure. The first anti-rotation structure includes a first rotating ring and a plurality of first anti-rotation devices. The first rotating ring is rotatably disposed inside the fixed housing. The plurality of first anti-rotation devices are spaced apart and surround the inner side of the first rotating ring. The first anti-rotation device includes a second return spring and a first anti-rotation plate. The outer side of the first screw thread barrel has a first anti-rotation opening. The two ends of the second return spring are fixedly connected to the first rotating ring and the first anti-rotation plate, respectively. The first anti-rotation plate is slidably connected to the first rotating ring. The end of the first anti-rotation plate away from the second return spring is located inside the first anti-rotation opening, and the first anti-rotation plate is provided with a first guide surface.

[0009] The screw thread structure for the lens barrel further includes a second anti-rotation structure. The second anti-rotation structure includes a second rotating ring and a plurality of second anti-rotation devices. The second rotating ring is rotatably disposed inside the fixed housing. The plurality of second anti-rotation devices are spaced apart and surround the inner side of the second rotating ring. The second anti-rotation device includes a third return spring and a second anti-rotation plate. The outer side of the first screw thread barrel has a second anti-rotation opening. The two ends of the third return spring are fixedly connected to the second rotating ring and the second anti-rotation plate, respectively. The second anti-rotation plate is slidably connected to the second rotating ring. The end of the second anti-rotation plate away from the third return spring is located inside the second anti-rotation opening, and the second anti-rotation plate is provided with a second guide surface in the opposite direction to the first guide surface.

[0010] The present invention provides a screw thread structure for a lens barrel. When the first thread or the second thread is worn, the first threaded sleeve or the second threaded sleeve can be removed from the fixed housing or the movable housing and replaced with a new first threaded sleeve or the second threaded sleeve. This ensures that the first thread and the second thread of the first threaded sleeve and the second threaded sleeve installed on the fixed housing and the movable housing can remain unworn, thereby maintaining the accuracy of the screw thread structure. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a structural cross-sectional view of the first embodiment of the present invention.

[0013] Figure 2 This is the invention Figure 1 Sectional view at point AA.

[0014] Figure 3 This is a structural cross-sectional view of the second embodiment of the present invention.

[0015] Figure 4 This is the invention Figure 3 Sectional view at point BB.

[0016] Figure 5 This is the invention Figure 3 Sectional view at point CC.

[0017] Figure 6 This is a structural cross-sectional view of the third embodiment of the present invention.

[0018] Figure 7 This is the invention Figure 6 Sectional view at point DD.

[0019] Figure 8 This is the invention Figure 6 Sectional view at EE.

[0020] 101-Fixed housing, 102-Modible housing, 103-First threaded barrel, 104-Second threaded barrel, 105-First thread, 106-Second thread, 107-Mounting cavity, 108-Connecting port, 109-First return spring, 110-Connecting bracket, 111-Strip-shaped limiting bracket, 112-Strip-shaped limiting groove, 201-First rotating ring, 202-Second return spring, 203-First anti-rotation plate, 204-First anti-rotation opening, 205-First guide surface, 206-Second rotating ring, 207-Third return spring, 208-Second anti-rotation plate, 209-Second anti-rotation opening, 210-Second guide surface, 301-Anti-slip strip, 302-Compression spring, 303-Toggle piece, 304-Blocking ring, 305-Opening. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] The first embodiment of this application is as follows:

[0023] Please see Figure 1 and Figure 2 , Figure 1 This is a structural cross-sectional view of the first embodiment of the present invention. Figure 2 This is the invention Figure 1 Sectional view at point AA.

[0024] This invention provides a threaded structure for a lens barrel, including a fixed housing 101, a movable housing 102, and a threaded assembly, wherein the threaded assembly includes a first threaded barrel 103 and a second threaded barrel 104;

[0025] The aforementioned solution solves the aforementioned problem. It is understood that the solution can be used in the case of screw threads in the lens barrel, and can also be used to solve the problem of wear and replacement of screw threads in other devices.

[0026] In this specific embodiment, one end of the movable housing 102 is disposed inside the fixed housing 101. The first threaded barrel 103 is detachably connected to the fixed housing 101 and is located inside the fixed housing 101. The second threaded barrel 104 is detachably connected to the movable housing 102 and is located outside the movable housing 102. The first threaded barrel 103 and the second threaded barrel 104 are threadedly connected. The inner side of the first threaded barrel 103 is provided with a first thread 105, and the outer side of the second threaded barrel 104 is provided with a second thread 106 that matches the first thread 105. The fixed housing 101 and the movable housing 102 are connected by the mutual engagement of the first threaded barrel 103 and the second threaded barrel 104. The first threaded barrel 103 and the second threaded barrel 104 are connected by the mutual engagement of the first thread 105 and the second thread 106. When the first thread 105 or the second thread 106 is worn, the first threaded barrel 103 or the second threaded barrel 104 can be removed from the fixed housing 101 or the movable housing 102 and replaced with a new first threaded barrel 103 or the second threaded barrel 104. This ensures that the first thread 105 and the second thread 106 of the first threaded barrel 103 and the second threaded barrel 104 installed on the fixed housing 101 and the movable housing 102 can remain unworn, thus maintaining the accuracy of the thread structure.

[0027] Specifically, both the fixed housing 101 and the movable housing 102 are provided with mounting cavities 107. A connecting structure is provided inside the mounting cavity 107. A connecting port 108 is provided on the outer side of the first threaded barrel 103 and the inner side of the second threaded barrel 104. The connecting structure includes a first return spring 109 and a connecting bracket 110. The first return spring 109 is fixedly disposed inside the mounting cavity 107, and the connecting bracket 110 is movably disposed inside the mounting cavity 107, with one end of the connecting bracket 110 located inside the connecting port 108. The connecting structure is used to connect the first threaded barrel 103 to the fixed housing 101 and the second threaded barrel 104 to the movable housing 102. The first return spring 109 abuts against the connecting bracket 110 so that one end of the connecting bracket 110 away from the first return spring 109 abuts out of the mounting cavity 107 and is located inside the connecting port 108, thereby fixing the first threaded barrel 103 to the fixed housing 101 and fixing the second threaded barrel 104 to the movable housing 102.

[0028] Furthermore, a strip-shaped limiting bracket 111 is provided on the outer side of the first threaded cylinder 103, and a strip-shaped limiting groove 112 adapted to the strip-shaped limiting bracket 111 is provided on the inner side of the fixed housing 101. The strip-shaped limiting bracket 111 is located inside the strip-shaped limiting groove 112. When the first threaded cylinder 103 is installed on the fixed housing 101, the strip-shaped limiting bracket 111 is aligned with the strip-shaped limiting groove 112 and inserted to position the first threaded cylinder 103 for installation. Simultaneously, since the movable housing 102 needs to rotate relative to the fixed housing 101 to adjust the focal length, the first threaded cylinder 103 needs to be fixed to the fixed housing 101 and cannot rotate. The strip-shaped limiting bracket 111 and the strip-shaped limiting groove 112 cooperate to restrict the movement of the first threaded cylinder 103, preventing it from rotating relative to the fixed housing 101. Similarly, the second threaded cylinder 104 and the movable housing 102 can be fixed in the same way.

[0029] When replacing the first threaded barrel 103 using a screw thread structure for a lens barrel according to this embodiment, the connecting bracket 110 is moved to disengage from the inside of the connecting port 108, allowing the first threaded barrel 103 to slide relative to the fixed housing 101. Then, the first threaded barrel 103 is pulled out of the fixed housing 101, allowing it to be disassembled. A new first threaded barrel 103 is then inserted into the inside of the fixed housing 101 and fixed by the connecting structure, thereby replacing the worn first threaded barrel 103 and ensuring the accuracy of the screw thread structure.

[0030] The second embodiment of this application is as follows:

[0031] Based on the first embodiment, please refer to Figures 3-5 , Figure 3 This is a structural cross-sectional view of the second embodiment of the present invention. Figure 4 This is the invention Figure 3 Sectional view at point BB. Figure 5 This is the invention Figure 3 Sectional view at point CC.

[0032] The screw structure for the lens barrel in this embodiment also includes a first anti-rotation structure and a second anti-rotation structure;

[0033] In this specific embodiment, the first anti-rotation structure includes a first rotating ring 201 and a plurality of first anti-rotation devices. The first rotating ring 201 is rotatably disposed inside the fixed housing 101. The plurality of first anti-rotation devices are spaced apart and surround the inner side of the first rotating ring 201. Each first anti-rotation device includes a second return spring 202 and a first anti-rotation plate 203. The outer side of the first threaded cylinder 103 has a first anti-rotation opening 204. The two ends of the second return spring 202 are fixedly connected to the first rotating ring 201 and the first anti-rotation plate 203, respectively. The first anti-rotation plate 203 is slidably connected to the first rotating ring 201. The end of the first anti-rotation plate 203 away from the second return spring 202 is located inside the first anti-rotation opening 204, and the first anti-rotation plate 203 is provided with a first guide surface 205. The first rotating ring 201 can rotate relative to the fixed housing 101. The second return spring 202 abuts against the first anti-rotation plate 203, so that the end of the first anti-rotation plate 203 away from the second return spring 202 is abutted into the interior of the first anti-rotation port 204, thereby increasing the fixing effect between the first threaded barrel 103 and the fixed housing 101. When the strip-shaped limiting bracket 111 fails, due to the blocking effect of the first anti-rotation plate 203, the first threaded barrel 103 still cannot rotate relative to the fixed housing 101. Since the first anti-rotation plate 203 is provided with the first guide surface 205, when the first rotating ring 201 is rotated in one direction, the first anti-rotation plate 203 is squeezed by the first threaded barrel 103 and retracts into the interior of the fixed housing 101, so as to facilitate the disassembly of the first threaded barrel 103.

[0034] Secondly, the second anti-rotation structure includes a second rotating ring 206 and a plurality of second anti-rotation devices. The second rotating ring 206 is rotatably disposed inside the fixed housing 101. The plurality of second anti-rotation devices are spaced apart and surround the inner side of the second rotating ring 206. The second anti-rotation device includes a third return spring 207 and a second anti-rotation plate 208. The outer side of the first threaded cylinder 103 has a second anti-rotation opening 209. The two ends of the third return spring 207 are fixedly connected to the second rotating ring 206 and the second anti-rotation plate 208, respectively. The second anti-rotation plate 208 is slidably connected to the second rotating ring 206. One end of the second anti-rotation plate 208 away from the third return spring 207 is located inside the second anti-rotation opening 209. The second anti-rotation plate 208 is provided with a second guide surface 210 opposite in direction to the first guide surface 205. The second rotating ring 206 can rotate relative to the fixed housing 101. The third return spring 207 abuts against the second anti-rotation plate 208, so that the end of the second anti-rotation plate 208 away from the third return spring 207 is abutted into the interior of the second anti-rotation port 209, thereby increasing the fixing effect between the first threaded barrel 103 and the fixed housing 101. When the strip-shaped limiting bracket 111 fails, due to the blocking effect of the second anti-rotation plate 208, the first threaded barrel 103 still cannot rotate relative to the fixed housing 101. Since the second anti-rotation plate 208 is provided with the second guide surface 210, and the direction of the second guide surface 210 is opposite to the direction of the first guide surface 205, when the second rotating ring 206 is rotated in the other direction, the second anti-rotation plate 208 is squeezed by the first threaded barrel 103 and retracts into the interior of the fixed housing 101, so as to facilitate the disassembly of the first threaded barrel 103. The first and second anti-rotation structures cooperate to improve the fixing effect between the first threaded barrel 103 and the fixed housing 101. When the first threaded barrel 103 needs to be disassembled, the first rotating ring 201 and the second rotating ring 206 need to be rotated in different directions simultaneously to disassemble the first threaded barrel 103, thereby increasing the stability between the first threaded barrel 103 and the housing. Similarly, the second threaded barrel 104 and the movable housing 102 can be stabilized in the same way.

[0035] When replacing the first threaded barrel 103 using a screw thread structure for a lens barrel according to this embodiment, the first rotating ring 201 is rotated according to the position direction of the first guide surface 205, and at the same time the second rotating ring 206 is rotated in the opposite direction, so that the first anti-rotation plate 203 and the second anti-rotation plate 208 are both retracted into the fixed housing 101. Then, the connecting bracket 110 is moved to make the connecting bracket 110 withdraw from the inside of the connecting port 108, so that the first threaded barrel 103 can slide relative to the fixed housing 101. Then, the first threaded barrel 103 is pulled out from the fixed housing 101, so that the first threaded barrel 103 can be disassembled. A new first threaded barrel 103 is then inserted into the inside of the fixed housing 101 and fixed by the connecting structure, thereby replacing the worn first threaded barrel 103 to ensure the accuracy of the screw thread structure.

[0036] The third embodiment of this application is as follows:

[0037] Based on the second embodiment, please refer to Figures 6-8 , Figure 6 This is a structural cross-sectional view of the third embodiment of the present invention. Figure 7 This is the invention Figure 6 Sectional view at DD in the middle. Figure 8 This is the invention Figure 6 Sectional view at EE.

[0038] In this embodiment, the movable housing 102 with the threaded structure of the lens barrel is provided with a plurality of anti-slip strips 301 on its outer side, and the plurality of anti-slip strips 301 surround the periphery of the movable housing 102. The plurality of anti-slip strips 301 are provided on the outer side of the movable housing 102 to increase the friction between the operator and the outside of the movable housing 102, so as to facilitate the operator to rotate the movable housing 102 to adjust the focal length.

[0039] Secondly, the movable housing 102 is also equipped with a toggle structure, which includes a compression spring 302 and a toggle plate 303. The two ends of the compression spring 302 are fixedly connected to the movable housing 102 and the toggle plate 303, respectively, while the toggle plate 303 is slidably connected to the movable housing 102. The compression spring 302 holds the toggle plate 303, pushing one end of the toggle plate 303 out of the movable housing 102. Operators can rotate the movable housing 102 using the toggle plate 303, thus facilitating the rotation of the movable housing.

[0040] In addition, the actuating structure also includes a blocking ring 304, which has an opening 305. The blocking ring 304 is rotatably connected to the movable housing 102 and is located on the outside of the movable housing 102. The blocking ring 304 can block the actuating piece 303, keeping it inside the movable housing 102. When it is necessary to use the actuating piece 303 to rotate the movable housing 102, the blocking ring 304 is rotated so that the actuating piece 303 extends out from the opening 305 under the action of the compression spring 302, allowing the operator to rotate the movable housing 102 using the actuating piece 303.

[0041] When adjusting the position of the movable housing 102 relative to the fixed housing 101 using a screw structure for the lens barrel according to this embodiment, the blocking ring 304 is rotated so that the actuating piece 303 extends out from the opening 305 under the action of the compression spring 302. The operator can then rotate the movable housing 102 by the actuating piece 303. After adjustment, the blocking ring 304 is rotated again to cover the actuating piece 303 inside the movable housing 102, and the movable housing 102 is then finely adjusted by rotating the movable housing 102 by the anti-slip strip 301.

[0042] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A threaded structure for a microscope tube, comprising a fixed housing and a movable housing, wherein one end of the movable housing is disposed inside the fixed housing, characterized in that, It also includes threaded components; The threaded assembly includes a first threaded barrel and a second threaded barrel. The first threaded barrel is detachably connected to the fixed housing and is located inside the fixed housing. The second threaded barrel is detachably connected to the movable housing and is located outside the movable housing. The first threaded barrel and the second threaded barrel are threadedly connected. The inner side of the first threaded barrel has a first thread, and the outer side of the second threaded barrel has a second thread that matches the first thread. The screw thread structure for the lens barrel further includes a first anti-rotation structure. The first anti-rotation structure includes a first rotating ring and a plurality of first anti-rotation devices. The first rotating ring is rotatably disposed inside the fixed housing. The plurality of first anti-rotation devices are spaced apart and surround the inner side of the first rotating ring. Each first anti-rotation device includes a second return spring and a first anti-rotation plate. The outer side of the first screw thread barrel has a first anti-rotation opening. The two ends of the second return spring are respectively fixedly connected to the first rotating ring and the first anti-rotation plate. The first anti-rotation plate is slidably connected to the first rotating ring. The end of the first anti-rotation plate away from the second return spring is located inside the first anti-rotation opening, and the first anti-rotation plate is provided with a first guide surface. The structure also includes a second anti-rotation structure, which includes a second rotating ring and a plurality of second anti-rotation devices. The second rotating ring is rotatably disposed inside the fixed housing, and the plurality of second anti-rotation devices are spaced apart around the inner side of the second rotating ring. The second anti-rotation device includes a third return spring and a second anti-rotation plate. The outer side of the first threaded cylinder has a second anti-rotation opening. The two ends of the third return spring are fixedly connected to the second rotating ring and the second anti-rotation plate, respectively. The second anti-rotation plate is slidably connected to the second rotating ring. The end of the second anti-rotation plate away from the third return spring is located inside the second anti-rotation opening, and the second anti-rotation plate is provided with a second guide surface in the opposite direction to the first guide surface.

2. The threaded structure for the lens barrel as described in claim 1, characterized in that, Both the fixed housing and the movable housing are provided with mounting cavities. A connecting structure is provided inside the mounting cavity. A connecting port is provided on the outer side of the first threaded barrel and the inner side of the second threaded barrel. The connecting structure includes a first return spring and a connecting bracket. The first return spring is fixedly disposed inside the mounting cavity, and the connecting bracket is movably disposed inside the mounting cavity, with one end of the connecting bracket located inside the connecting port.

3. The threaded structure for the lens barrel as described in claim 2, characterized in that, A strip-shaped limiting bracket is provided on the outer side of the first threaded cylinder, and a strip-shaped limiting groove adapted to the strip-shaped limiting bracket is provided on the inner side of the fixed housing. The strip-shaped limiting bracket is located inside the strip-shaped limiting groove.

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