Focusing mechanism of ophthalmoscope

Abstract

The utility model belongs to the technical field of ophthalmoscopes, and discloses an ophthalmoscope focusing mechanism which comprises an eyepiece, a mounting frame, an imaging assembly, a sliding seat, a sliding block and a driving mechanism, the mounting frame comprises a bottom plate, a first vertical plate and a second vertical plate, the eyepiece is arranged on one side of the first vertical plate, the sliding seat and the driving mechanism are arranged on the first vertical plate, and the sliding block is arranged on the sliding seat. The imaging assembly is arranged on the sliding block, a first sliding hole is horizontally formed in the sliding block, a first sliding rod is arranged in the first sliding hole in a sliding mode, the first sliding rod is vertically arranged on the sliding seat in a sliding mode, a calibration plate is arranged on one side of the eyepiece, a second sliding hole is vertically formed in the sliding block, and a second sliding rod is vertically arranged in the second sliding hole in a sliding mode. The second sliding rod is horizontally arranged on a sliding seat in a sliding mode, and a first adjusting mechanism and a second adjusting mechanism are arranged on the sliding seat. And the first adjusting mechanism and the second adjusting mechanism adjust the position of the sliding block, so that the position of the imaging assembly returns to the initially set position, and the imaging quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of ophthalmoscopes, in particular to an ophthalmoscope focusing mechanism. Background Art

[0002] In the field of ophthalmic diagnostic instruments, in vivo non-invasive detection of retinal fundus blood vessels and their distribution status can be used to diagnose eye diseases such as macula, optic nerve, and glaucoma, and even brain nerve-related diseases. At the same time, observing the extent of fundus lesions is also of great reference value for evaluating systemic diseases such as diabetes, hypertension, and kidney disease. Therefore, fundus imaging examinations play a very important role. Among them, the important part of ophthalmoscope imaging is focusing. After focusing, the eye image can be obtained, and then the image can be processed and analyzed by computers.

[0003] A Chinese utility model patent with publication number CN219179676U discloses an ophthalmoscope focusing mechanism, which includes an eyepiece, a back plate, an imaging assembly, a limit assembly, a motor and a transmission assembly, wherein the limit assembly is slidably mounted on the back plate, the imaging assembly and the motor are both mounted on the limit assembly, the transmission assembly includes a rack and a gear, the eyepiece and the rack are both mounted on the back plate, the imaging assembly includes a reflecting component, the reflecting component includes a reflecting surface, the reflecting surface faces the eyepiece, the gear is meshed with the rack, the motor is connected to the gear and drives the gear to move along the extension direction of the rack to adjust the distance between the eyepiece and the imaging assembly.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: the imaging component of the above-mentioned device is fixed on the limiting component. After long-term use, the position of the imaging component may change due to mechanical wear or collision of the device, thereby affecting the imaging quality of the imaging component. Utility Model Content

[0005] In order to solve the above problems, the utility model provides an ophthalmoscope focusing mechanism.

[0006] The above technical object of the present utility model is achieved by the following technical solutions: An ophthalmoscope focusing mechanism, comprising an eyepiece, a mounting bracket and an imaging assembly. The mounting bracket includes a bottom plate, a first vertical plate and a second vertical plate vertically arranged on the bottom plate. The eyepiece is arranged on the side of the first vertical plate away from the second vertical plate. A first slide rail is horizontally arranged on the first vertical plate. A sliding seat is slidably arranged on the first slide rail. A driving mechanism for driving the sliding seat to slide is arranged on the first vertical plate. A sliding block is arranged on the sliding seat. The imaging assembly is arranged on the sliding block. A first slide hole is horizontally opened on the sliding block. A first slide bar is horizontally slidably arranged in the first slide hole. The first slide bar is vertically slidably arranged on the sliding seat. A first adjusting mechanism for driving the first slide bar to slide is arranged on the sliding seat. A calibration plate is horizontally arranged on the side of the eyepiece close to the imaging assembly. A second slide hole is vertically opened on the sliding block. A second slide bar is vertically slidably arranged in the second slide hole. The second slide bar is horizontally slidably arranged on the sliding seat. A second adjusting mechanism for driving the second slide bar to slide is arranged on the sliding seat.

[0007] By adopting the above technical solutions, the sliding seat, the driving mechanism, the sliding block, the first adjusting mechanism, the calibration plate and the second adjusting mechanism are provided. When it is necessary to calibrate the position of the imaging assembly, the driving mechanism is used to drive the imaging assembly to slide towards the eyepiece until it slides to the zero position. Then, the first adjusting mechanism is used to drive the first sliding bar to rise, thereby driving the sliding block and the imaging assembly to rise until the top of the imaging assembly contacts the calibration plate on the eyepiece, so that the vertical position of the imaging assembly returns to the initially set position. Subsequently, the second adjusting mechanism is used to drive the second sliding bar to move towards the eyepiece until the imaging assembly contacts the eyepiece, so that the horizontal position of the imaging assembly returns to the initially set position. After the adjustment, the accuracy of the position of the imaging assembly is ensured, thereby ensuring the imaging quality.

[0008] Further, the driving mechanism includes a driving block arranged on the side of the sliding seat close to the first slide rail. Two mounting blocks are horizontally spaced on the first vertical plate. A lead screw is rotatably arranged between the two mounting blocks. The lead screw is parallel to the first slide rail. The driving block is in spiral cooperation with the lead screw through a threaded hole. A driving motor is horizontally arranged on the second vertical plate. The output shaft of the driving motor passes through the second vertical plate and is connected to the end of the lead screw.

[0009] By adopting the above technical solutions, the driving block, the mounting blocks, the lead screw and the driving motor are provided. The driving motor is used to drive the lead screw to rotate, thereby driving the driving block to move on the lead screw, and further driving the sliding seat to slide on the first slide rail.

[0010] Further, two second slide rails arranged vertically are horizontally spaced on the side of the sliding seat away from the first slide rail. Both ends of the first slide bar are slidably arranged on the corresponding second slide rails through sliders.

[0011] By adopting the above technical solution, two vertically arranged second sliding rails are horizontally and spaced apart on the side of the sliding seat away from the first sliding rail, ensuring the stability of the up-and-down sliding of the first sliding rod on the sliding seat.

[0012] Furthermore, the first adjusting mechanism includes a first adjusting block provided at one end of the first sliding rod. A first threaded rod is vertically rotatably provided on the sliding seat. The first adjusting block is in screw fit with the first threaded rod through a threaded hole. A first worm gear is coaxially provided at the lower end of the first threaded rod. A first mounting platform is provided on the sliding seat. A first worm is horizontally rotatably provided on the first mounting platform. The first worm is engaged with the first worm gear.

[0013] By adopting the above technical solution, with the first adjusting block, the first threaded rod, the first worm gear, the first mounting platform, and the first worm, when the first worm is rotated, since the first worm is engaged with the first worm gear, the first worm gear and the first threaded rod are driven to rotate. Since the first threaded rod is in screw fit with the first adjusting block, when the first threaded rod rotates, the first adjusting block moves up and down on the first threaded rod, thereby driving the first sliding rod to slide on the second sliding rail.

[0014] Furthermore, two horizontally arranged third sliding rails are vertically and spaced apart on the side of the sliding seat away from the first sliding rail. Both ends of the second sliding rod are slidably provided on the corresponding third sliding rails through sliders.

[0015] By adopting the above technical solution, two horizontally arranged third sliding rails are vertically and spaced apart on the side of the sliding seat away from the first sliding rail, ensuring the stability of the left-and-right sliding of the second sliding rod on the sliding seat.

[0016] Furthermore, the second adjusting mechanism includes a second adjusting block provided at one end of the first sliding rod. A second threaded rod is horizontally rotatably provided on the sliding seat. The second adjusting block is in screw fit with the second threaded rod through a threaded hole. A second worm gear is coaxially provided at one end of the second threaded rod. A second mounting platform is provided on the sliding seat. A second worm is horizontally rotatably provided on the second mounting platform. The second worm is engaged with the second worm gear.

[0017] By adopting the above technical solution, with the second adjusting block, the second threaded rod, the second worm gear, the second mounting platform, and the second worm, when the second worm is rotated, since the second worm is engaged with the second worm gear, the second worm gear and the second threaded rod are driven to rotate. Since the second threaded rod is in screw fit with the second adjusting block, when the second threaded rod rotates, the second adjusting block moves left and right on the second threaded rod, thereby driving the second sliding rod to slide on the third sliding rail.

[0018] Further, a grating scale is provided on the first vertical plate. The main scale of the grating scale is horizontally arranged on the first vertical plate, and the reading head of the grating scale is connected to the sliding seat.

[0019] By adopting the above technical solution, a grating scale is provided on the first vertical plate. The distance of the sliding of the sliding seat is measured by the grating scale, and the measured data is fed back.

[0020] In summary, the present utility model has the following beneficial effects: In this application, a sliding seat, a driving mechanism, a sliding block, a first adjusting mechanism, a calibration plate, and a second adjusting mechanism are provided. When it is necessary to calibrate the position of the imaging component, the imaging component is driven by the driving mechanism to slide towards the eyepiece until it slides to the zero position. Then, the first adjusting mechanism is used to drive the first sliding rod to rise, thereby driving the sliding block and the imaging component to rise until the top of the imaging component contacts the calibration plate on the eyepiece, so that the vertical position of the imaging component returns to the initially set position. Subsequently, the second adjusting mechanism is used to drive the second sliding rod to move towards the eyepiece until the imaging component contacts the eyepiece, so that the horizontal position of the imaging component returns to the initially set position. After the adjustment, the accuracy of the position of the imaging component is ensured, thereby ensuring the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of the embodiment of the present utility model;

[0022] Figure 2 is the structural schematic diagram of the first slide rail, the driving mechanism, and the imaging component part of the embodiment of the present utility model;

[0023] Figure 3 is the structural schematic diagram of the sliding seat, the sliding block, the first adjusting mechanism, and the second adjusting mechanism part of the embodiment of the present utility model.

[0024] In the figure: 10, eyepiece; 11, imaging component; 12, calibration plate; 20, mounting bracket; 21, bottom plate; 22, first vertical plate; 221, grating scale; 23, second vertical plate; 24, first slide rail; 25, sliding seat; 26, sliding block; 261, first slide bar; 262, second slide bar; 27, second slide rail; 28, third slide rail; 30, driving mechanism; 31, driving block; 32, mounting block; 33, lead screw; 34, driving motor; 40, first adjusting mechanism; 41, first adjusting block; 42, first threaded rod; 43, first worm gear; 44, first mounting table; 45, first worm; 50, second adjusting mechanism; 51, second adjusting block; 52, second threaded rod; 53, second worm gear; 54, second mounting table; 55, second worm. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] As Figures 1-3 shown, an ophthalmoscope focusing mechanism is disclosed in an embodiment of the present application, which includes an eyepiece 10, a mounting bracket 20, an imaging assembly 11, a sliding seat 25, a sliding block 26, a driving mechanism 30, a first adjusting mechanism 40, and a second adjusting mechanism 50. The mounting bracket 20 includes a bottom plate 21. A first vertical plate 22 and a second vertical plate 23 are vertically arranged on the bottom plate 21. The second vertical plate 23 is perpendicular to the first vertical plate 22. The eyepiece 10 is arranged on the side of the first vertical plate 22 away from the second vertical plate 23. A first slide rail 24 is horizontally arranged on the first vertical plate 22. The sliding seat 25 is slidably arranged on the first slide rail 24. The driving mechanism 30 is arranged on the first vertical plate 22 and is used to drive the sliding seat 25 to slide. A sliding block 26 is arranged on the sliding seat 25. The imaging assembly 11 is arranged on the sliding block 26. When the sliding seat 25 moves, it drives the imaging assembly 11 to move, thereby calibrating the position of the imaging assembly 11.

[0027] Specifically, a first slide hole is horizontally opened on the sliding block 26. A first slide bar 261 is horizontally slidably arranged in the first slide hole. Two vertically arranged second slide rails 27 are horizontally spaced on the side of the sliding seat 25 away from the first slide rail 24. Both ends of the first slide bar 261 are slidably arranged on the corresponding second slide rails 27 through sliders, ensuring the stability of the up-and-down sliding of the first slide bar 261 on the sliding seat 25. A first adjusting mechanism 40 for driving the first slide bar 261 to slide is arranged on the sliding seat 25. The first adjusting mechanism 40 includes a first adjusting block 41 arranged at one end of the first slide bar 261. A first threaded rod 42 is vertically rotatably arranged on the sliding seat 25. The first adjusting block 41 is in screw fit with the first threaded rod 42 through a threaded hole. When the first threaded rod 42 rotates, the first adjusting block 41 moves up and down on the first threaded rod 42, thereby driving the first slide bar 261 to slide on the second slide rail 27.

[0028] A first worm gear 43 is coaxially arranged at the lower end of the first threaded rod 42. A first mounting platform 44 is arranged on the sliding seat 25. A first worm 45 is horizontally rotatably arranged on the first mounting platform 44. The first worm 45 is engaged with the first worm gear 43. By rotating the first worm 45, the first worm gear 43 and the first threaded rod 42 are driven to rotate. Since the worm and worm gear have self-locking property, that is, only the worm can drive the worm gear, after the first threaded rod 42 adjusts the first adjusting block 41, the positions of the first adjusting block 41 and the first slide rod 261 will not change. Thus, the vertical positions of the slider 26 and the imaging assembly 11 relative to the sliding seat 25 are fixed. A calibration plate 12 is horizontally arranged on one side of the eyepiece 10 close to the imaging assembly 11. When it is necessary to calibrate the vertical position of the imaging assembly 11, rotate the first worm 45 to drive the first worm gear 43 and the first threaded rod 42 to rotate, so that the first adjusting block 41 moves up and down on the first threaded rod 42, thereby driving the first slide rod 261, the slider 26, and the imaging assembly 11 to slide on the second slide rail 27 until the top of the imaging assembly 11 contacts the calibration plate 12, making the vertical position of the imaging assembly 11 return to the initially set position, thus ensuring the imaging quality.

[0029] When setting, the imaging assembly 11 includes a light source, a reflection component, a mounting seat, and a photodetector. The reflection component includes a reflection surface. The mounting seat is provided with a through hole. The reflection component is obliquely installed on the mounting seat, and the reflection surface faces the through hole. The light emitted by the light source is reflected by the reflection component and enters the fundus through the eyepiece 10 for illumination; the reflected light of the fundus sequentially passes through the eyepiece 10 and the reflection component and enters the photodetector for imaging. The eyepiece 10 includes a lens and a lens barrel. The lens is installed on the lens barrel. At the initially set position, the extension direction of the eyepiece 10 and the extension direction of the through hole are on the same straight line, and the incident light emitted by the imaging assembly 11 passes through the lens and enters the human eye.

[0030] During specific settings, a second sliding hole is vertically formed in the sliding block 26, and a second sliding rod 262 is vertically and slidably arranged in the second sliding hole. Two horizontally arranged third sliding rails 28 are vertically spaced on the side of the sliding seat 25 away from the first sliding rail 24. Both ends of the second sliding rod 262 are slidably arranged on the corresponding third sliding rails 28 through sliders, ensuring the stability of the left-right sliding of the second sliding rod 262 on the sliding seat 25. The second sliding rod 262 is horizontally slidably arranged on the sliding seat 25, and a second adjusting mechanism 50 for driving the second sliding rod 262 to slide is arranged on the sliding seat 25. The driving mechanism 30 includes a driving block 31 arranged on the side of the sliding seat 25 close to the first sliding rail 24. Two mounting blocks 32 are horizontally spaced on the first vertical plate 22, and a lead screw 33 is rotatably arranged between the two mounting blocks 32. The lead screw 33 is parallel to the first sliding rail 24. The driving block 31 is in screw fit with the lead screw 33 through a threaded hole. A driving motor 34 is horizontally arranged on the second vertical plate 23, and the output shaft of the driving motor 34 passes through the second vertical plate 23 and is connected to the end of the lead screw 33. The second adjusting mechanism 50 includes a second adjusting block 51 arranged at one end of the first sliding rod 261. A second threaded rod 52 is horizontally rotatably arranged on the sliding seat 25. The second adjusting block 51 is in screw fit with the second threaded rod 52 through a threaded hole. When the second threaded rod 52 rotates, the second adjusting block 51 moves left and right on the second threaded rod 52, thereby driving the second sliding rod 262 to slide on the third sliding rail 28.

[0031] A second worm gear 53 is coaxially arranged at one end of the second threaded rod 52. A second mounting platform 54 is arranged on the sliding seat 25, and a second worm 55 is horizontally rotatably arranged on the second mounting platform 54. The second worm 55 is engaged with the second worm gear 53. By rotating the second worm 55, the second worm gear 53 and the second threaded rod 52 are driven to rotate. Since the worm and worm gear have self-locking property, that is, only the worm can drive the worm gear, after the second threaded rod 52 adjusts the second adjusting block 51, the positions of the second adjusting block 51 and the second sliding rod 262 will not change, so that the lateral positions of the sliding block 26 and the imaging assembly 11 relative to the sliding seat 25 are fixed. When it is necessary to calibrate the lateral position of the imaging assembly 11, rotate the second worm 55, thereby driving the second worm gear 53 and the second threaded rod 52 to rotate, so that the second adjusting block 51 moves left and right on the second threaded rod 52, thereby driving the second sliding rod 262, the sliding block 26, and the imaging assembly 11 to slide until the mounting seat contacts the lens barrel, so that the vertical position of the imaging assembly 11 returns to the initially set position, thus ensuring the imaging quality.

[0032] A grating scale 221 is also provided on the first vertical plate 22. The main grating scale of the grating scale 221 is horizontally arranged on the first vertical plate 22, and the reading head of the grating scale 221 is connected to the sliding seat 25. The distance of the sliding of the sliding seat 25 is measured by the grating scale 221, and the measured data is fed back to the control system, and the control system then controls the drive motor 34 to ensure the accuracy of the sliding of the sliding seat 25.

[0033] In this embodiment, the working principle of an ophthalmoscope focusing mechanism is as follows: When it is necessary to calibrate the position of the imaging assembly 11, first rotate the first worm 45 to drive the first worm gear 43 and the first threaded rod 42 to rotate, thereby driving the first slide bar 261 and the sliding block 26 and the imaging assembly 11 to move downward. Then rotate the second worm 55 to drive the second worm gear 53 and the second threaded rod 52 to rotate, thereby driving the second slide bar 262 and the sliding block 26 to move away from the eyepiece 10. Then start the drive motor 34 to drive the lead screw 33 to rotate, driving the sliding seat 25, the sliding block 26, and the imaging assembly 11 to move toward the eyepiece 10 to the zero position. Then rotate the first worm 45 to drive the first worm gear 43 and the first threaded rod 42 to rotate, thereby driving the first slide bar 261 and the sliding block 26 and the imaging assembly 11 to move upward until the top of the mounting seat contacts the calibration plate 12. Then rotate the second worm 55 to drive the second worm gear 53 and the second threaded rod 52 to rotate, thereby driving the second slide bar 262 and the sliding block 26 to move toward the eyepiece 10 until the mounting seat contacts the eyepiece 10, so that the lateral position of the imaging assembly 11 returns to the initially set position. After adjustment, the accuracy of the position of the imaging assembly 11 is ensured, thereby ensuring the imaging quality.

[0034] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A fundus camera focusing mechanism, comprising an eyepiece (10), a mounting bracket (20) and an imaging component (11), characterized in that: The mounting bracket (20) includes a bottom plate (21), a first vertical plate (22) and a second vertical plate (23) vertically arranged on the bottom plate (21). The eyepiece (10) is arranged on the side of the first vertical plate (22) away from the second vertical plate (23). A first slide rail (24) is horizontally arranged on the first vertical plate (22). A sliding seat (25) is slidably arranged on the first slide rail (24). A driving mechanism (30) for driving the sliding seat (25) to slide is arranged on the first vertical plate (22). A sliding block (26) is arranged on the sliding seat (25). The imaging assembly (11) is arranged on the sliding block (26). A first sliding hole is horizontally formed in the sliding block (26). A first sliding rod (261) is horizontally slidably arranged in the first sliding hole. The first sliding rod (261) is vertically slidably arranged on the sliding seat (25). A first adjusting mechanism (40) for driving the first sliding rod (261) to slide is arranged on the sliding seat (25). A calibration plate (12) is horizontally arranged on the side of the eyepiece (10) close to the imaging assembly (11). A second sliding hole is vertically formed in the sliding block (26). A second sliding rod (262) is vertically slidably arranged in the second sliding hole. The second sliding rod (262) is horizontally slidably arranged on the sliding seat (25). A second adjusting mechanism (50) for driving the second sliding rod (262) to slide is arranged on the sliding seat (25).

2. The focusing mechanism of an ophthalmoscope according to claim 1, characterized in that: The driving mechanism (30) includes a driving block (31) arranged on the side of the sliding seat (25) close to the first slide rail (24). Two mounting blocks (32) are horizontally arranged at intervals on the first vertical plate (22). A lead screw (33) is rotatably arranged between the two mounting blocks (32). The lead screw (33) is parallel to the first slide rail (24). The driving block (31) is in screw fit with the lead screw (33) through a threaded hole. A driving motor (34) is horizontally arranged on the second vertical plate (23). The output shaft of the driving motor (34) passes through the second vertical plate (23) and is connected to the end of the lead screw (33).

3. The focusing mechanism of an ophthalmoscope according to claim 1, wherein: Two second slide rails (27) arranged vertically are horizontally arranged at intervals on the side of the sliding seat (25) away from the first slide rail (24). Both ends of the first sliding rod (261) are slidably arranged on the corresponding second slide rails (27) through sliders.

4. The ophthalmoscope focusing mechanism according to claim 1, characterized in that: The first adjusting mechanism (40) includes a first adjusting block (41) arranged at one end of the first sliding rod (261). A first threaded rod (42) is vertically rotatably arranged on the sliding seat (25). The first adjusting block (41) is in screw fit with the first threaded rod (42) through a threaded hole. A first worm gear (43) is coaxially arranged at the lower end of the first threaded rod (42). A first mounting platform (44) is arranged on the sliding seat (25). A first worm (45) is horizontally rotatably arranged on the first mounting platform (44). The first worm (45) is engaged with the first worm gear (43).

5. The focusing mechanism of an ophthalmoscope according to claim 1, characterized in that: On one side of the sliding seat (25) away from the first slide rail (24), two horizontally arranged third slide rails (28) are vertically spaced, and both ends of the second slide bar (262) are slidably arranged on the corresponding third slide rails (28) through sliders.

6. The ophthalmoscope focusing mechanism according to claim 1, characterized in that: The second adjusting mechanism (50) includes a second adjusting block (51) arranged at one end of the first slide bar (261). A second threaded rod (52) is horizontally rotatably arranged on the sliding seat (25). The second adjusting block (51) is in screw fit with the second threaded rod (52) through a threaded hole. A second worm gear (53) is coaxially arranged at one end of the second threaded rod (52). A second mounting table (54) is arranged on the sliding seat (25). A second worm (55) is horizontally rotatably arranged on the second mounting table (54). The second worm (55) is engaged with the second worm gear (53).

7. The focusing mechanism of an ophthalmoscope according to claim 1, characterized in that: A grating ruler (221) is further arranged on the first vertical plate (22). The main grating ruler of the grating ruler (221) is horizontally arranged on the first vertical plate (22), and the reading head of the grating ruler (221) is connected to the sliding seat (25).

Images