An apparatus for detecting visual function

Abstract

The utility model relates to visual function detection technical field, especially visual function detection instrument, including base, be equipped with detection appearance on the base, and the detection appearance first end is equipped with display screen, and the detection appearance second end is equipped with camera lens, frame, the frame is fixed on the base through fixed component, and the frame is equipped with camera lens protection board and slides, and camera lens protection board and camera lens correspond to set up, are used for the shielding or exposure of camera lens, the frame is movably equipped with mandibular support pad, and mandibular support pad is equipped with the drive assembly for driving camera lens protection board displacement on, when camera lens protection board and camera lens correspond, are used for the shielding of camera lens, when camera lens protection board and camera lens are misaligned, are used for the exposure of camera lens. Set up like this, when not working, through camera lens protection board shielding camera lens, can prevent the exposure of camera lens, and further effectively avoid that camera lens is damaged by external force knock.

Description

Technical Field

[0001] This utility model relates to the field of visual function testing technology, specifically to a visual function testing instrument, and more specifically to a visual function testing instrument with protective functions. Background Technology

[0002] Visual function testing instruments are used to measure eye function indicators such as visual acuity, intraocular pressure, and corneal curvature.

[0003] Utility model patent CN220275571U discloses a vision and visual function testing device that can switch between multiple distances. It features a simple structure and adjustable target distance for vision measurement. The target is moved via a movable robotic arm or guide rail, allowing for real-time adjustment. The headframe also improves measurement accuracy. This prior art enables a wide range of vision measurements, meeting the needs for assessing mid-range vision and visual quality. However, because the lens is a precision component, it is exposed both during operation and when not in use, making it susceptible to damage from external impacts.

[0004] Therefore, there is still room for improvement in existing technologies. Utility Model Content

[0005] In order to solve the problem that the lenses of existing visual function testing instruments are easily damaged, this utility model proposes a visual function testing instrument.

[0006] To achieve the above objectives, the technical solution applied in this utility model is as follows:

[0007] A visual function testing instrument includes a base, on which a testing instrument is mounted. A display screen is mounted at one end of the testing instrument, and a lens is mounted at the other end. A frame is fixed to the base by a fixing component. A lens protection plate is slidably mounted on the frame, corresponding to the lens, for either shielding or exposing the lens. A chin support pad is movably mounted within the frame, and a driving component is mounted on the chin support pad to drive the lens protection plate to move. When the lens protection plate corresponds to the lens, it shields the lens; when the lens protection plate is misaligned with the lens, it exposes the lens.

[0008] According to the above scheme, a hollow shell is fixed on the side of the frame near the base, and the lens protection plate is horizontally slidable on the hollow shell. The lens protection plate includes a lens protection plate one and a lens protection plate two. The lens protection plate one and the lens protection plate two are driven to open or close by a driving component. When the lens protection plate one and the lens protection plate two are open, they are used to expose the lens. When the lens protection plate one and the lens protection plate two are closed, they are used to shield the lens.

[0009] According to the above scheme, a connecting plate is fixed on the first lens protective plate, and a rack is fixed on the connecting plate; a slanted plate is fixed on the second lens protective plate, and a rack is fixed on the slanted plate. A gear meshes between the rack and the rack, and the slanted surface of the slanted plate corresponds to the drive assembly; a guide rod is fixed on the inner wall of the hollow shell, and a limit block is fixed after the guide rod passes through the connecting plate. A reset spring is sleeved on the guide rod between the limit block and the connecting plate.

[0010] According to the above scheme, the chin support pad is located in the frame and can be raised and lowered by sliding column. The driving component includes a return spring, a connecting frame and a ball head. The first end of the connecting frame is fixedly connected to the sliding column, and the second end of the connecting frame passes through the hollow shell and is fixedly connected to the ball head. The ball head abuts against the inclined surface of the inclined panel of the lens protective plate. The two ends of the return spring are fixed to the sliding column and the frame respectively.

[0011] According to the above scheme, the hollow shell is provided with a sliding groove for sliding connection with lens protection plate one and lens protection plate two.

[0012] According to the above scheme, the gear is rotatably mounted on the inner wall of the hollow shell via a central shaft.

[0013] According to the above scheme, the hollow shell is provided with sliding holes for sliding connection with the connecting frame.

[0014] According to the above scheme, the fixing component includes a positioning seat and a magnetic seat. The positioning seat is located on the side of the base near the frame. The first end of the magnetic seat is fixed inside the positioning seat, and the second end of the magnetic seat is magnetically fixed to the frame.

[0015] The beneficial effects of this utility model are:

[0016] This invention is designed so that when not in use, the lens is protected by a lens shield to prevent it from being exposed, thus effectively avoiding damage to the lens from external impacts. When in use, the subject's chin rests on a chin support pad, which is driven downward by gravity. This, in turn, drives the drive assembly on the chin support pad to move the lens shield. When the lens shield and the lens are misaligned, the lens is exposed, and it can then be used for testing without the need for manual operation, making it convenient to use. Attached Figure Description

[0017] Figure 1 This is a front perspective view of the overall structure of this utility model;

[0018] Figure 2 This is a rear-view perspective view of the overall structure of this utility model;

[0019] Figure 3 yes Figure 2 Schematic diagram showing the removal of the frame and chin support pad;

[0020] Figure 4 This is a schematic diagram of the mandibular support pad of this utility model;

[0021] Figure 5 This is a cross-sectional schematic diagram of the lens protection plate and drive assembly of this utility model.

[0022] In the picture:

[0023] 1. Base; 2. Detector; 3. Positioning seat; 4. Magnetic seat; 5. Frame; 6. Sliding column; 7. Jaw support pad; 8. Return spring one; 9. Connecting bracket; 10. Ball head; 11. Hollow shell; 12. Lens protection plate one; 13. Slanted panel; 14. Connecting plate; 15. Rack one; 16. Rack two; 17. Central shaft; 18. Gear; 19. Guide rod; 20. Limiting block; 21. Return spring two; 22. Lens protection plate two; 23. Lens; 24. Display screen. Detailed Implementation

[0024] The technical solution of this utility model will be described below with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 5 As shown, the visual function testing instrument of this utility model includes a base 1, on which a testing instrument 2 is mounted. The first end of the testing instrument 2 is equipped with a display screen 24, and the second end of the testing instrument 2 is equipped with a lens 23. A frame 5 is fixed to the base 1 by a fixing component. A lens protection plate is slidably mounted on the frame 5, and the lens protection plate is correspondingly arranged with the lens 23 for shielding or exposing the lens 23. A chin support pad 7 is movably mounted inside the frame 5. The chin support pad 7 is equipped with a driving component for driving the lens protection plate to move. When the lens protection plate is corresponding with the lens 23, it is used to shield the lens 23. When the lens protection plate is misaligned with the lens 23, it is used to expose the lens 23. With this configuration, when not in use, the lens 23 is shielded by the lens protective plate, preventing the lens 23 from being exposed and thus effectively avoiding damage to the lens 23 from external impacts. When in use, the subject's chin rests on the chin support pad 7, and gravity drives the chin support pad 7 to slide downwards, thereby driving the drive component on the chin support pad 7 to move the lens protective plate. When the lens protective plate and the lens 23 are misaligned, the lens 23 is exposed, and it can be used for testing without manual operation, making it convenient to use.

[0026] Furthermore, a hollow shell 11 is fixed to the side of the frame 5 near the base 1. A lens protection plate is horizontally slidable on the hollow shell 11. The lens protection plate includes a first lens protection plate 12 and a second lens protection plate 22. The first lens protection plate 12 and the second lens protection plate 22 are driven to open or close by a driving component. When the first lens protection plate 12 and the second lens protection plate 22 are open, they are used to expose the lens 23. When the first lens protection plate 12 and the second lens protection plate 22 are closed, they are used to block the lens 23. In this configuration, there are two lenses 23, arranged side by side, for corresponding to two eye detections. The first lens protection plate 12 and the second lens protection plate 22 correspond to the two lenses 23 respectively. When not in operation, the first lens protection plate 12 and the second lens protection plate 22 are in a closed state, respectively, used to block the two lenses 23. When in operation, the first lens protection plate 12 and the second lens protection plate 22 are in an open state, respectively, forming a misalignment with the two lenses 23, used to expose the two lenses 23.

[0027] Furthermore, a connecting plate 14 is fixed on the lens protective plate 12, and a rack 15 is fixed on the connecting plate 14; a sloping plate 13 is fixed on the lens protective plate 22, and a rack 16 is fixed on the sloping plate 13. A gear 18 meshes between the rack 15 and the rack 16, and the sloping surface of the sloping plate 13 is correspondingly arranged with the drive assembly; a guide rod 19 is fixed on the inner wall of the hollow shell 11, and a limit block 20 is fixed after the guide rod 19 passes through the connecting plate 14. A reset spring 21 is sleeved on the guide rod 19 between the limit block 20 and the connecting plate 14. With this setup, during operation, the subject's chin rests on the chin support pad 7. Under gravity, the chin support pad 7 slides downward, which in turn drives the drive assembly downward, causing the inclined panel 13 to move horizontally, thus moving the lens protection plate 22 horizontally. During the horizontal movement of the inclined panel 13, the rack 16 and gear 18 rotate. The rotation of gear 18 causes the rack 15 to move horizontally, which in turn causes the connecting plate 14 and lens protection plate 12 to move, thus putting the lens protection plate 12 and lens protection plate 22 into an open state. When the subject's chin is removed from the chin support pad 7, the connecting plate 14 and lens protection plate 12 are reset by the reset spring 21. During the reset, the rack 15 and gear 18 rotate, which in turn causes the rack 16 to move horizontally, and the rack 16 moves horizontally, thus resetting the inclined panel 13 and lens protection plate 22.

[0028] Furthermore, the chin support pad 7 is located within the frame 5 and can be raised and lowered and slidably via the sliding column 6. The driving assembly includes a return spring 8, a connecting frame 9, and a ball head 10. The first end of the connecting frame 9 is fixedly connected to the sliding column 6, and the second end of the connecting frame 9 passes through the hollow shell 11 and is fixedly connected to the ball head 10. The ball head 10 abuts against the inclined surface of the inclined plate 13 of the lens protective plate 22. The two ends of the return spring 8 are respectively fixed to the sliding column 6 and the frame 5. With this configuration, during operation, the chin of the person being tested rests on the chin support pad 7, and under gravity, the chin support pad 7 slides downward, thereby causing the sliding column 6 and the connecting frame 9 to move downward. The connecting frame 9 causes the ball head 10 to move downward, and the inclined surface of the ball head 10 and the inclined plate 13 changes, pushing the inclined plate 13 to move the lens protective plate 22 horizontally. During the horizontal movement of the inclined plate 13, the rack 16 and the gear 18 rotate. The rotation of the gear 18 causes the rack 15 to move horizontally. The displacement of the rack 15 causes the connecting plate 14 and the lens protective plate 22 to move horizontally. The head protection plate 12 is displaced, so that the lens protection plate 12 and the lens protection plate 22 are in the open state. When the chin of the subject is disengaged from the chin support pad 7, the connecting plate 14 and the lens protection plate 12 are reset under the reset spring 21. During the reset, the rack 15 and the gear 18 rotate. The rotation of the gear 18 drives the rack 2 16 to move horizontally. The displacement of the rack 2 16 drives the inclined plate 13 and the lens protection plate 22 to reset. At the same time, under the reset spring 8, the sliding column 6 drives the connecting frame 9 and the ball head 10 to reset upward.

[0029] Furthermore, the hollow shell 11 is provided with a sliding groove for sliding connection with the lens protection plate 12 and the lens protection plate 22.

[0030] Furthermore, the gear 18 is rotatably mounted on the inner wall of the hollow shell 11 via the central shaft 17. This arrangement limits the movement of the gear 18 via the central shaft 17, ensuring that the gear 18 rotates in the same position during rotation.

[0031] Furthermore, the hollow shell 11 is provided with sliding holes for sliding connection with the connecting frame 9.

[0032] In practical applications, the connecting frame 9 has an L-shaped structure, with its upper end horizontally fixed to the outer wall of the slide rod 6, and its lower end set parallel to the slide rod 6 at intervals. When the slide rod 6 moves up and down, the connecting frame 9 moves up and down synchronously.

[0033] Furthermore, the fixing assembly includes a positioning seat 3 and a magnetic seat 4. The positioning seat 3 is located on the side of the base 1 near the frame 5. The first end of the magnetic seat 4 is fixed inside the positioning seat 3, and the second end of the magnetic seat 4 is magnetically fixed to the frame 5. This arrangement makes it easy to assemble and disassemble the frame 5.

[0034] The embodiments of the present utility model have been described above with reference to the accompanying drawings. However, the present utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present utility model without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of the present utility model.

Claims

1. A visual function testing instrument, characterized in that, include: A base (1) is provided with a detector (2), the detector (2) has a display screen (24) at its first end and a lens (23) at its second end; The frame (5) is fixed to the base (1) by a fixing component. A lens protection plate is slidably provided on the frame (5). The lens protection plate is correspondingly provided with the lens (23) for shielding or exposing the lens (23). The frame (5) is provided with a movable mandibular support pad (7), and the mandibular support pad (7) is provided with a driving component for driving the displacement of the lens protective plate. When the lens protective plate corresponds to the lens (23), it is used to block the lens (23). When the lens protective plate is misaligned with the lens (23), it is used to expose the lens (23).

2. The visual function testing instrument according to claim 1, characterized in that: A hollow shell (11) is fixed on the side of the frame (5) near the base (1). The lens protection plate is horizontally slidable on the hollow shell (11). The lens protection plate includes a lens protection plate one (12) and a lens protection plate two (22). The lens protection plate one (12) and the lens protection plate two (22) are driven to open or close by a drive assembly. When the lens protection plate one (12) and the lens protection plate two (22) are open, they are used to expose the lens (23). When the lens protection plate one (12) and the lens protection plate two (22) are closed, they are used to block the lens (23).

3. A visual function testing instrument according to claim 2, characterized in that: A connecting plate (14) is fixed on the lens protective plate one (12), and a rack one (15) is fixed on the connecting plate (14); a slanted plate (13) is fixed on the lens protective plate two (22), and a rack two (16) is fixed on the slanted plate (13); a gear (18) meshes between the rack one (15) and the rack two (16); the slanted surface of the slanted plate (13) is correspondingly set with the drive assembly; a guide rod (19) is fixed on the inner wall of the hollow shell (11); a limit block (20) is fixed after the guide rod (19) passes through the connecting plate (14); a reset spring two (21) is sleeved on the guide rod (19) between the limit block (20) and the connecting plate (14).

4. A visual function testing instrument according to claim 2, characterized in that: The chin support pad (7) is located in the frame (5) and can be raised and lowered by sliding column (6). The drive assembly includes a return spring (8), a connecting frame (9) and a ball head (10). The first end of the connecting frame (9) is fixedly connected to the sliding column (6). The second end of the connecting frame (9) passes through the hollow shell (11) and is fixedly connected to the ball head (10). The ball head (10) abuts against the inclined surface of the inclined panel (13) of the lens protective plate (22). The two ends of the return spring (8) are fixed to the sliding column (6) and the frame (5) respectively.

5. A visual function testing instrument according to claim 2, characterized in that: The hollow shell (11) is provided with a sliding groove for sliding connection with lens protection plate one (12) and lens protection plate two (22).

6. A visual function testing instrument according to claim 3, characterized in that: The gear (18) is rotatably mounted on the inner wall of the hollow shell (11) via the central shaft (17).

7. A visual function testing instrument according to claim 4, characterized in that: The hollow shell (11) is provided with sliding holes for sliding connection with the connecting frame (9).

8. A visual function testing instrument according to claim 1, characterized in that: The fixing component includes a positioning seat (3) and a magnetic seat (4). The positioning seat (3) is located on the side of the base (1) near the frame (5). The first end of the magnetic seat (4) is fixed inside the positioning seat (3), and the second end of the magnetic seat (4) is magnetically fixed to the frame (5).

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