Optometer control handle
By adopting a radial needle roller bearing and metal bushing design in the refractometer control handle, the problems of high sliding friction resistance and unstable operation of traditional refractometer control handles are solved, achieving smoothness of the handle, reduced noise, simplified structure and convenient assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHONGQING YEASN SCI & TECH CO LTD
- Filing Date
- 2023-07-26
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional optometers have complex control handles with high sliding friction resistance, poor rigidity, unstable operation, and cumbersome assembly.
The radial needle roller bearing design replaces the sliding pair with a rolling pair, and combined with the metal bushing and button electronic components, it achieves smoothness and reduced noise in the handle.
The smoothness and stability of the control handle rotation have been improved, rotation noise has been reduced, and the structure and assembly process have been simplified.
Smart Images
Figure CN116807385B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ophthalmic equipment technology, and in particular to a control handle for an optometer. Background Technology
[0002] Traditional optometry instrument control handles on the market are typically complex in structure and cumbersome to install. Furthermore, the rotating shaft and bushing usually employ a sliding fit design, and to save costs, the rotating sleeve is generally made of plastic. This structure presents several problems: due to the sliding fit of the rotating joint, the sliding friction resistance during rotation is slightly higher, resulting in poor smoothness of the handle rotation; the plastic bushing design has slightly lower rigidity, causing noticeable wobbling and deflection when the handle is pushed forcefully, leading to poor operational stability; the complex structure makes assembly cumbersome and installation time-consuming and labor-intensive.
[0003] In conclusion, how to effectively solve problems such as the lack of smooth rotation of the control handle is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention
[0004] The purpose of this invention is to provide an optometer control handle that improves the smoothness of rotation, reduces rotation noise, and significantly enhances the operability of the handle.
[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:
[0006] An optometer control handle includes a base assembly, a ball joint with its ball end mounted on the base assembly, a ball joint seat and a bottom cover sequentially fitted onto the ball joint, a connecting sleeve fixedly connected to the upper end of the ball joint and having a stepped outer wall, a radial needle roller bearing fitted around the connecting sleeve and having its bottom surface touching the stepped surface, a handle rotation sleeve fitted around the radial needle roller bearing and having its bottom surface touching the stepped surface, and a button bracket fixedly connected to the connecting sleeve and having its bottom surface located on the top surface of the radial needle roller bearing and the handle rotation sleeve. The handle rotation sleeve, the radial needle roller bearing, and the connecting sleeve constitute a rolling motion pair.
[0007] Optionally, the handle rotating bushing has a metal bushing fitted on its inner wall that mates with the radial needle roller bearing, and the metal bushing is fitted and connected to the outer ring of the radial needle roller bearing.
[0008] Optionally, it also includes a button electronic component installed on the top of the button bracket, a top cover connected to the upper end of the handle rotating shaft sleeve, and a button installed in the through hole of the top cover. The button is clearance-fitted with the through hole, and the button moves up and down in the through hole to trigger the button electronic component.
[0009] Optionally, the inner bottom surface of the bottom cover has a stepped surface, the gasket is fitted onto the ball joint shaft and its bottom surface presses against the stepped surface, and the nut is connected to the outer screw of the ball joint shaft and presses against the gasket.
[0010] Optionally, the top cover and the handle rotating bushing are connected by a snap-fit.
[0011] The top cover is provided with multiple limiting blocks in the circumferential direction that match the inner wall of the handle rotating shaft sleeve.
[0012] Optionally, it also includes a code disk installed in the annular groove of the handle rotation shaft sleeve and a photoelectric switch electronic component installed on the side wall of the button bracket, the photoelectric switch electronic component being used to detect the rotation signal of the code disk;
[0013] The photoelectric switch electronic component is connected and fixed to the side wall of the button bracket by photoelectric switch locking screws.
[0014] Optionally, the upper end of the connecting bushing has an external thread, the button bracket has a first threaded hole, and the button bracket is threadedly connected to the connecting bushing.
[0015] Optionally, a lower flat pad is provided on the step surface;
[0016] An upper flat pad is provided between the top surface of the radial needle roller bearing and the handle rotating bushing and the bottom surface of the button bracket.
[0017] Optionally, the side wall of the button bracket has a second threaded hole, and a tapered set screw is connected to the second threaded hole with its end abutting against the side wall of the connecting bushing.
[0018] Optionally, the upper end of the ball head shaft has an external screw, and the lower end of the connecting bushing has a third threaded hole of the upper length. The connecting bushing is threadedly connected to the ball head shaft, and the connecting bushing is rotated and screwed into the top of the ball head shaft for fastening.
[0019] The beneficial effects of this invention are that the optometer control handle includes a base assembly, a ball joint shaft, a ball joint seat, a bottom cover, a connecting bushing, a radial needle roller bearing, a handle rotation bushing, and a button bracket. The ball joint end of the ball joint shaft is mounted on the base assembly, and the ball joint seat and the bottom cover are sequentially fitted onto the ball joint shaft. The lower end of the connecting bushing is fixedly connected to the upper end of the ball joint shaft, and the connecting bushing and the ball joint shaft are connected as a whole.
[0020] The outer wall of the connecting sleeve has a stepped surface. The radial needle roller bearing is fitted onto the outside of the connecting sleeve. The inner ring of the radial needle roller bearing is clearance-fitted with the outer wall of the connecting sleeve. The clearance is small, allowing for smooth connection and synchronous movement. The bottom surface of the radial needle roller bearing rests on the stepped surface, which supports the radial needle roller bearing.
[0021] The handle rotation sleeve is fitted over the radial needle roller bearing, with a clearance fit between the handle rotation sleeve and the outer ring of the radial needle roller bearing. The bottom surface of the handle rotation sleeve rests on the stepped surface, which provides support for the handle rotation sleeve.
[0022] The button bracket is fixedly connected to the connecting bushing. The bottom surface of the button bracket is located on the top surface of the radial needle roller bearing and the handle rotating bushing. The button bracket limits the top surface of the radial needle roller bearing and the handle rotating bushing.
[0023] The handle rotating bushing, the radial needle roller bearing, and the connecting bushing form a rolling motion pair, and the handle rotating bushing rotates around the connecting bushing through the radial needle roller bearing.
[0024] The optometer control handle provided by this invention uses a special radial needle roller bearing, changing the rotating pair from a traditional sliding pair design to a rolling pair. After the change, the frictional resistance of the rotating pair is reduced, the smoothness of rotation is improved, and the rotation noise is reduced at the same time, greatly improving the handle's operability. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 A schematic diagram of the structure of an optometer provided in a specific embodiment of this application;
[0027] Figure 2 Another view of the refractometer;
[0028] Figure 3 A schematic diagram of the structure of an optometer control handle provided in a specific embodiment of the present invention;
[0029] Figure 4 This is a magnified view of a portion of the refractometer's control handle.
[0030] The following labels are shown in the attached diagram:
[0031] 1-Button; 2-Top cover; 3-Button electronic component; 4-Code disk; 5-Handle rotating bushing; 6-Handle rubber sleeve; 7-Radial needle roller bearing; 8-Lower flat washer; 9-Bottom cover; 10-Button bracket; 11-Photoelectric switch electronic component; 12-Conical end set screw; 13-Photoelectric switch locking screw; 14-Connecting bushing; 15-Ball head shaft; 16-Nut; 17-Washer; 18-Ball head seat; 19-Base assembly. Detailed Implementation
[0032] The core of this invention is to provide an optometer control handle that improves the smoothness of rotation, reduces rotation noise, and significantly enhances the handle's operability.
[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of the structure of an optometer provided in a specific embodiment of this application; Figure 2 Another view of the refractometer; Figure 3 A schematic diagram of the structure of an optometer control handle provided in a specific embodiment of the present invention; Figure 4 This is a magnified view of a portion of the refractometer's control handle.
[0035] In one specific embodiment, the optometer control handle provided by the present invention includes a base assembly 19, a ball joint shaft 15 with its ball end mounted on the base assembly 19, a ball joint seat 18 and a bottom cover 9 sequentially fitted onto the ball joint shaft 15, a connecting bushing 14 fixedly connected to the upper end of the ball joint shaft 15 and having a stepped surface on its outer wall, a radial needle roller bearing 7 fitted outside the connecting bushing 14 and having its bottom surface overlapping the stepped surface, a handle rotation bushing 5 fitted outside the radial needle roller bearing 7 and having its bottom surface overlapping the stepped surface, and a button bracket 10 fixedly connected to the connecting bushing 14 and having its bottom surface located on the top surface of the radial needle roller bearing 7 and the handle rotation bushing 5. The handle rotation bushing 5, the radial needle roller bearing 7, and the connecting bushing 14 constitute a rolling motion pair.
[0036] In the above structure, the optometer control handle includes a base assembly 19, a ball joint shaft 15, a ball joint seat 18, a bottom cover 9, a connecting bushing 14, a radial needle roller bearing 7, a handle rotation bushing 5, and a button bracket 10. The ball joint end of the ball joint shaft 15 is mounted on the base assembly 19, and the ball joint seat 18 and the bottom cover 9 are sequentially fitted onto the ball joint shaft 15. The lower end of the connecting bushing 14 is fixedly connected to the upper end of the ball joint shaft 15, and the connecting bushing 14 and the ball joint shaft 15 are connected as a whole.
[0037] The outer wall of the connecting sleeve 14 has a stepped surface. The radial needle roller bearing 7 is fitted onto the outer wall of the connecting sleeve 14. The inner ring of the radial needle roller bearing 7 is clearance-fitted with the outer wall of the connecting sleeve 14. The clearance is small, allowing for smooth connection and synchronous movement. The bottom surface of the radial needle roller bearing 7 rests on the stepped surface, and the stepped surface supports the radial needle roller bearing 7.
[0038] The handle rotation sleeve 5 is fitted over the radial needle roller bearing 7, and the handle rotation sleeve 5 and the outer ring of the radial needle roller bearing 7 are clearance-fitted. The bottom surface of the handle rotation sleeve 5 rests on the stepped surface, and the stepped surface supports the handle rotation sleeve 5.
[0039] The button bracket 10 is fixedly connected to the connecting bushing 14. The bottom surface of the button bracket 10 is located on the top surface of the radial needle roller bearing 7 and the handle rotating bushing 5. The button bracket 10 limits the top surface of the radial needle roller bearing 7 and the handle rotating bushing 5.
[0040] The handle rotating bushing 5, the radial needle roller bearing 7, and the connecting bushing 14 form a rolling motion pair, and the handle rotating bushing 5 rotates around the connecting bushing 14 through the radial needle roller bearing 7.
[0041] The optometer control handle provided by this invention uses a special radial needle roller bearing 7 to change the rotating pair from the traditional sliding pair design to a rolling pair. After the change, the frictional resistance of the rotating pair is reduced, the smoothness of rotation is improved, and the rotation noise is reduced at the same time, and the controllability of the handle is greatly improved.
[0042] Based on the above specific embodiments, the handle rotating bushing 5 has a metal bushing embedded in its inner wall that mates with the radial needle roller bearing 7, and the metal bushing is fitted and connected to the outer ring of the radial needle roller bearing 7.
[0043] In some specific embodiments, a metal bushing is embedded in the inner wall of the handle rotating bushing 5 that mates with the radial needle roller bearing 7, and the metal bushing is fitted to the outer ring of the radial needle roller bearing 7. The metal bushing and the radial needle roller bearing 7 form a rigid rotating pair, which has good strength and high operational reliability.
[0044] Specifically, the handle rotating bushing 5 and the metal bushing can be injection molded, which offers high reliability; alternatively, they can be connected by screws, both of which are within the scope of this invention. The metal bushing can be made of stainless steel, which is not easily worn and has a low cost; or it can be made of high-carbon steel, which has high hardness and good wear resistance.
[0045] Based on the above specific embodiments, it also includes a button electronic component 3 installed on the top of the button bracket 10, a top cover 2 connected to the upper end of the handle rotating shaft sleeve 5, and a button 1 installed in the through hole of the top cover 2. The button 1 is in clearance fit with the through hole, and the button 1 moves up and down in the through hole to trigger the button electronic component 3.
[0046] In some specific embodiments, the optometer control handle also includes a button electronic component 3, a top cover 2, and a button 1. The button electronic component 3 is mounted on the top of the button bracket 10, which supports the button electronic component 3. The top cover 2 is connected to the upper end of the handle rotation sleeve 5. After connection, the top cover 2 encapsulates the internal components of the handle rotation sleeve 5. Optionally, a handle rubber sleeve 6 is fitted on the handle rotation sleeve 5 to increase friction and facilitate rotation of the handle rotation sleeve 5.
[0047] The top cover 2 has a through hole at its center, which is aligned with the position of the button electronic component 3. Button 1 is installed inside the through hole of the top cover 2. Button 1 is fitted with the through hole with a clearance of, for example, 0.2mm. After being installed in the through hole, button 1 can move freely up and down within the through hole. When button 1 is pressed down, it moves downward, and the bottom surface of button 1 contacts the button electronic component 3, triggering the button electronic component 3. The button electronic component 3 is connected to the control board, triggering the control board to perform actions, such as controlling the optometry instrument to align with the optical measurement unit in the vertical direction, and setting the optical measurement unit to the desired height by adjusting the driving direction and speed of the optical measurement unit.
[0048] Button 1 can move smoothly in the through hole of top cover 2 and can quickly trigger button electronic component 3; and button 1 is lightweight, and the restoring force of button electronic component 3 can pop button 1 back to its original position, with a simple structure and simple connection.
[0049] Based on the above specific embodiments, the inner bottom surface of the bottom cover 9 has a stepped surface, the gasket 17 is fitted onto the ball head shaft 15 and the bottom surface presses against the stepped surface, and the nut 16 is connected to the outer screw of the ball head shaft 15 and presses against the gasket 17.
[0050] In some specific embodiments, the bottom cover 9 is fitted onto the ball head shaft 15. At the reduced diameter of the bottom cover 9, the inner bottom surface of the bottom cover 9 forms a stepped surface. The washer 17 and nut 16 are sequentially connected to the ball head shaft 15, and the base assembly 19, ball head seat 18, bottom cover 9, and ball head shaft 15 are locked together by the nut 16. The optometer control handle has a stacked structure from bottom to top, which is lightweight and compact, simple and convenient to install, time-saving, and easy to maintain.
[0051] Based on the above specific embodiments, the top cover 2 and the handle rotating bushing 5 are connected by a snap-fit;
[0052] The top cover 2 is provided with multiple limiting blocks in the circumferential direction that match the inner wall of the handle rotation bushing 5.
[0053] In some specific embodiments, the lower part of the top cover 2 has multiple buckles in the circumferential direction, and the handle rotating bushing 5 has a groove that matches the buckles. During connection, the buckles engage with the grooves, thus connecting the top cover 2 and the handle rotating bushing 5. The top cover 2 and the handle rotating bushing 5 are detachably connected, making connection and disassembly convenient. Alternatively, the top cover 2 and the handle rotating bushing 5 can also be connected by threads, which is also convenient.
[0054] The top cover 2 is provided with multiple limiting blocks in the circumferential direction. The limiting blocks and the buckle are on the same pitch circle. The outer side of the limiting block is in contact with the inner wall of the handle rotating shaft sleeve 5. The circumferential connection position of the top cover 2 and the handle rotating shaft sleeve 5 is positioned by the limiting blocks, and the connection is more accurate and not easy to misalign.
[0055] Based on the above specific embodiments, it also includes a code disk 4 installed in the annular groove of the handle rotation bushing 5 and a photoelectric switch electronic component 11 installed on the side wall of the button bracket 10. The photoelectric switch electronic component 11 is used to detect the rotation signal of the code disk 4.
[0056] The photoelectric switch electronic component 11 is connected and fixed to the side wall of the button bracket 10 by the photoelectric switch locking screw 13.
[0057] In some specific embodiments, the optometer control handle also includes a code disk 4 and a photoelectric switch electronic component 11. The outer wall of the handle rotation bushing 5 has an annular groove, and the code disk 4 is installed in the annular groove of the handle rotation bushing 5. The specific housing is connected by a snap-fit, which is convenient for connection.
[0058] The photoelectric switch electronic component 11 is mounted on the side wall of the button bracket 10, and the photoelectric switch electronic component 11 is connected and fixed to the side wall of the button bracket 10 by the photoelectric switch locking screw 13.
[0059] The photoelectric switch electronic component 11 is used to detect the rotation signal of the code disk 4. The code disk 4 can be a grating rotating code disk. When the test technician operates the code disk 4 to rotate, the grating slit of the code disk 4 passes between the infrared light source and the infrared light receiving element of the dual-path grating control board, sending two pulse signals with different timings to the optometry control board. The control board can detect the rotation direction and speed from the displacement between the two pulse signals. It is used in computer optometry when the optical measurement unit is aligned with the examinee's eye, and has high sensitivity.
[0060] In another more reliable embodiment, based on any of the above embodiments, the upper end of the connecting bushing 14 has an external thread, and the button bracket 10 has a first threaded hole. The button bracket 10 is threadedly connected to the connecting bushing 14, which is convenient for connection and easy for assembly, disassembly and maintenance. Rotating the button bracket 10 can adjust the axial clearance of the handle rotating bushing 5, so that there is a small gap between the handle rotating bushing 5 and the button bracket 10, ensuring that the axial movement of the handle rotating bushing 5 is small and the stability is good. At the same time, it ensures that the handle rotating bushing 5 rotates smoothly and easily with low noise and good operability.
[0061] Based on the above specific embodiments, a lower flat pad 8 is provided on the step surface;
[0062] An upper flat pad is provided between the top surface of the radial needle roller bearing 7 and the handle rotating bushing 5 and the bottom surface of the button bracket 10.
[0063] In some specific embodiments, flat pads are provided on the top and bottom surfaces of the radial needle roller bearing 7 and the handle rotating bushing 5. The flat pads can be rubber pads, which have a protective effect on the radial needle roller bearing 7 and the handle rotating bushing 5.
[0064] Based on the above specific embodiments, the side wall of the button bracket 10 has a second threaded hole, and the tapered set screw 12 is connected to the second threaded hole with its end abutting against the side wall of the connecting bushing 14. When the axial movement of the rotating handle rotating bushing 5 is small and the rotating handle rotating bushing 5 rotates smoothly, the tapered set screw 12 is used to lock and fix it, thereby locking the relative position of the connecting bushing 14 and the button bracket 10 and preventing the button bracket 10 from shifting.
[0065] Based on the above specific embodiments, the upper end of the ball head shaft 15 has an external screw, the lower end of the connecting bushing 14 has a third threaded hole of the upper length, the connecting bushing 14 and the ball head shaft 15 are connected by threads, and the connecting bushing 14 is rotated and screwed into the top of the ball head shaft 15 for fastening.
[0066] In some specific embodiments, the top surface of the third threaded hole forms a stepped surface, allowing the lower end of the connecting sleeve 14 to be rotated and screwed into the top of the ball head shaft 15 for fastening. That is, the top of the ball head shaft 15 rests on the stepped surface of the third threaded hole, achieving connection and positioning between the ball head shaft 15 and the connecting sleeve 14. Optionally, the upper end of the connecting sleeve 14 is designed with a slot for locking, facilitating the use of tools for tightening during installation.
[0067] In summary, when assembling the refractometer control handle, first install the ball head shaft 15 into the base assembly 19, then install the ball head seat 18, bottom cover 9, and washer 17 onto the ball head shaft 15 in sequence, and tighten them with nut 16; then rotate and screw the connecting bushing 14 into the top of the ball head shaft 15 and tighten it. The upper end of the connecting bushing 14 is designed with a slot for locking, which facilitates the use of tools to tighten it; then install the lower flat washer 8, radial needle roller bearing 7, handle rotating bushing 5, and upper flat washer onto the step of the connecting bushing 14 in sequence, and then rotate and screw the button bracket 10 into the threaded hole at the upper end of the connecting bushing 14 until it reaches the upper flat washer end face. At this time, rotating the button bracket 10 can adjust the axial clearance of the handle rotating bushing 5. When the axial movement of the handle rotating bushing 5 is small and the handle rotating bushing 5 rotates smoothly, then tighten it with tapered set screw 12. Next, install the encoder 4 into the handle rotating shaft sleeve 5, with the encoder 4 snapping into the annular groove of the handle rotating shaft sleeve 5. Then, install the photoelectric switch electronic component 11 onto the button bracket 10 and secure it with the photoelectric switch locking screw 13. Next, install the button electronic component 3 onto the top of the button bracket 10 and connect it with two screws. Then, place the button 1 into the through hole of the top cover 2 and install the top cover 2 onto the handle rotating shaft sleeve 5, with the top cover 2 snapping into the groove of the handle rotating shaft sleeve 5. Finally, fit the handle rubber sleeve 6 onto the handle rotating shaft sleeve 5.
[0068] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0069] The foregoing has provided a detailed description of the refractometer control handle provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention. Therefore, this invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A control handle for an optometer, characterized in that, The assembly includes a base assembly (19), a ball joint shaft (15) with its ball end mounted on the base assembly (19), a ball joint seat (18) and a bottom cover (9) sequentially fitted onto the ball joint shaft (15), a connecting bushing (14) fixedly connected to the upper end of the ball joint shaft (15) and having a stepped outer wall, a radial needle roller bearing (7) fitted onto the connecting bushing (14) and having its bottom surface overlapping the stepped surface, and a radial needle roller bearing (7) fitted onto the radial needle roller bearing (7) and having its bottom surface overlapping the stepped surface. The handle rotating bushing (5) is fixedly connected to the connecting bushing (14) and the bottom surface of the radial needle roller bearing (7) and the handle rotating bushing (5) are located on the top surface of the handle rotating bushing (5). The handle rotating bushing (5), the radial needle roller bearing (7) and the connecting bushing (14) form a rolling motion pair. The upper end of the connecting bushing (14) has an external thread. The button bracket (10) has a first threaded hole. The button bracket (10) is threadedly connected to the connecting bushing (14).
2. The refractometer control handle according to claim 1, characterized in that, The handle rotating bushing (5) has a metal bushing embedded in its inner wall that mates with the radial needle roller bearing (7), and the metal bushing is fitted with the outer ring of the radial needle roller bearing (7).
3. The refractometer control handle according to claim 2, characterized in that, It also includes a button electronic component (3) installed on the top of the button bracket (10), a top cover (2) connected to the upper end of the handle rotating bushing (5), and a button (1) installed in the through hole of the top cover (2). The button (1) is clearance-fitted with the through hole, and the button (1) moves up and down in the through hole to trigger the button electronic component (3).
4. The refractometer control handle according to claim 3, characterized in that, The bottom surface of the bottom cover (9) has a stepped surface. The gasket (17) is fitted onto the ball head shaft (15) and its bottom surface presses against the stepped surface. The nut (16) is connected to the outer screw of the ball head shaft (15) and presses against the gasket (17).
5. The refractometer control handle according to claim 3, characterized in that, The top cover (2) and the handle rotating bushing (5) are connected by a snap fastener; The top cover (2) is provided with a plurality of limiting blocks in the circumferential direction that match the inner wall of the handle rotating bushing (5).
6. The refractometer control handle according to claim 2, characterized in that, It also includes a code disk (4) installed in the annular groove of the handle rotating shaft sleeve (5) and a photoelectric switch electronic component (11) installed on the side wall of the button bracket (10). The photoelectric switch electronic component (11) is used to detect the rotation signal of the code disk (4). The photoelectric switch electronic component (11) is connected and fixed to the side wall of the button bracket (10) by the photoelectric switch locking screw (13).
7. The refractometer control handle according to claim 1, characterized in that, A lower flat pad (8) is provided on the surface of the step. An upper flat pad is provided between the top surface of the radial needle roller bearing (7) and the handle rotating bushing (5) and the bottom surface of the button bracket (10).
8. The refractometer control handle according to claim 7, characterized in that, The side wall of the button bracket (10) has a second threaded hole, and the tapered set screw (12) is connected to the second threaded hole and its end abuts against the side wall of the connecting bushing (14).
9. The refractometer control handle according to claim 1, characterized in that, The upper end of the ball head shaft (15) has an external screw, and the lower end of the connecting bushing (14) has a third threaded hole of the upper length. The connecting bushing (14) and the ball head shaft (15) are connected by threads. The connecting bushing (14) is rotated and screwed into the top of the ball head shaft (15) for fastening.