An LED optometric chart

Abstract

The utility model discloses an ophthalmic examination uses LED visual chart, including LED visual chart, the rear side fixed mounting of LED visual chart has the connecting lug, the bottom surface of connecting lug is opened and is limited to the groove, the inside plug connection of limit groove has the connecting plug, the rear side of LED visual chart is provided with the height adjusting assembly connected with connecting plug, the inside of limit groove is provided with the limiting component connected with connecting plug, the limiting component includes circular slot, limit plug, connecting pull rod, spring and connecting groove, the inside wall of limit groove is opened circularly and has the circular slot, the inside of circular slot is provided with limit plug, the utility model discloses the height adjusting assembly of setting, can adjust LED visual chart height flexibly, promotes the convenience and flexibility, through setting up the limiting component, the installation and dismounting of LED visual chart become extremely simple, greatly improves the operation efficiency, and provides the convenience for subsequent maintenance, replacement and so on work.

Description

Technical Field

[0001] This utility model relates to the field of LED vision chart technology, specifically to an LED vision chart for ophthalmic examination. Background Technology

[0002] LED vision charts for ophthalmic examinations use LED light-emitting diodes as their light source. Compared to traditional vision charts, their brightness is more uniform and adjustable, adapting to different ambient light conditions and ensuring examination accuracy. The optotypes on the screen are clear and sharp, typically including various types such as E-shapes in different directions and graphics suitable for children, meeting the testing needs of various groups. They have advantages such as low power consumption, long lifespan, and good stability. They are easy to operate, allowing for optotype switching and brightness adjustment via remote control or connection to a computer or other devices. They are widely used in hospital ophthalmology departments, health check-up centers, and other places, providing a reliable and efficient tool for vision testing.

[0003] Existing eye charts, especially LED eye charts used in hospitals or clinics, are mostly installed on walls or brackets using traditional bolt fixing methods. Although this installation method is stable, the disassembly process is cumbersome, time-consuming, and labor-intensive when the eye chart needs to be moved, maintained, or replaced. It may also require professional tools, which reduces the convenience and efficiency of use and increases maintenance costs. Therefore, it is necessary to design an LED eye chart for ophthalmological examination that is practical and easy to install and disassemble. Utility Model Content

[0004] The purpose of this invention is to provide an LED vision chart for ophthalmic examination to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an LED visual acuity chart for ophthalmic examination, comprising an LED visual acuity chart, wherein a connecting protrusion is fixedly installed on the rear side of the LED visual acuity chart, a limiting groove is formed on the bottom surface of the connecting protrusion, a connecting plug is inserted into the limiting groove, a height adjustment component connected to the connecting plug is provided on the rear side of the LED visual acuity chart, and a limiting component connected to the connecting plug is provided inside the limiting groove;

[0006] The limiting component includes a circular groove, a limiting block, a connecting rod, a spring, and a connecting groove. The inner wall of the limiting groove has symmetrically formed circular grooves. The limiting block is disposed inside the circular groove. A connecting rod is fixedly installed on one side of the limiting block. One end of the connecting rod extends to the outside of the connecting protrusion. A spring is disposed on the outer surface of the connecting rod. One end of the spring is fixed to one side of the limiting block, and the other end of the spring is fixed to the inner wall of the circular groove. The inner wall of the connecting block has symmetrically formed connecting grooves corresponding to the limiting block.

[0007] According to the above technical solution, the height adjustment assembly includes a fixed rod, an adjusting screw, a motor, and a threaded adjusting block. The fixed rod is provided on the rear side of the LED vision chart. The adjusting screw is provided inside the fixed rod. The motor is fixedly installed on the top surface of the fixed rod. The driving end of the motor is fixed to the top end of the adjusting screw. The threaded adjusting block is threadedly connected to the outer surface of the adjusting screw. The front end of the threaded adjusting block is fixed to one side of the connecting plug.

[0008] According to the above technical solution, multiple mounting plates are symmetrically fixedly installed on the side of the fixing rod, and mounting holes are opened on each of the multiple sides.

[0009] According to the above technical solution, a bearing is fixedly installed on the inner bottom surface of the fixing rod, and the bottom end of the adjusting screw is fixedly installed in the middle of the bearing.

[0010] According to the above technical solution, placement tubes are fixedly installed on the left and right sides of the LED vision chart.

[0011] According to the above technical solution, a connecting end is fixedly installed at one end of the connecting rod that extends to the outside of the connecting protrusion.

[0012] According to the above technical solution, the end of the limiting plug away from the connecting rod is provided with an arc-shaped surface.

[0013] According to the above technical solution, the limiting groove is a T-shaped groove, the connecting plug is a T-shaped block, and the limiting groove is adapted to the connecting plug.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: the height adjustment component of this utility model can flexibly adjust the height of the LED vision chart, which can be easily adapted for both children and adults to conduct vision tests, improving convenience and flexibility. At the same time, the installation and disassembly of the LED vision chart are extremely simple through the setting of the limiting component, which greatly improves the operating efficiency and provides convenience for subsequent maintenance, replacement and other work. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall front sectional view of this utility model;

[0017] Figure 2 This is a schematic diagram of the connecting protrusion structure of this utility model;

[0018] Figure 3This is a schematic diagram of the LED vision chart of this utility model before installation;

[0019] Figure 4 This is the utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0020] Figure 5 This is a schematic diagram of the threaded adjusting block structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the connecting groove structure of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-6 This utility model provides a technical solution: an LED visual acuity chart for ophthalmic examination, including an LED visual acuity chart 1, with placement tubes 8 fixedly installed on the left and right sides of the LED visual acuity chart 1; the placement tubes 8 facilitate the storage and placement of the indicator sticks, thus providing convenience for subsequent vision testing for patients. The LED visual acuity chart generally consists of an LED display screen, a driving circuit, a control circuit, a power module, and a housing. The LED display screen is composed of numerous LED beads arranged to display visual targets. The driving circuit provides electrical signals to the LED beads to make them emit light. The control circuit regulates the parameters of the visual targets. The power module provides power. The housing provides protection and support. During vision testing, the control circuit, through the driving circuit, causes the LED beads to emit light as required to form visual targets. The light enters the human eye for identification. The brightness of the LED beads is adjusted to adapt to the ambient light to ensure the accuracy of the test. The above structures are all existing structures widely used in current LED visual acuity charts, which are relatively mature and well-known in related fields, and will not be described in detail here.

[0024] Please see Figure 2-6 A connecting protrusion 2 is fixedly installed on the rear side of the LED eye chart 1. A limiting groove 3 is formed on the bottom surface of the connecting protrusion 2. A connecting plug 4 is inserted into the limiting groove 3. The limiting groove 3 is a T-shaped groove, and the connecting plug 4 is a T-shaped block. The limiting groove 3 and the connecting plug 4 are adapted to each other. By setting the limiting groove 3 to be a T-shaped groove and the connecting plug 4 to be a T-shaped block, it is easy for the connecting plug 4 to be inserted into the limiting groove 3. This facilitates the initial positioning and installation of the LED eye chart 1 and improves the connection stability.

[0025] Please see Figure 1-5 The LED eye chart 1 has a height adjustment component 5 connected to the connecting plug 4 on the rear side, and a limiting component 6 connected to the connecting plug 4 is provided inside the limiting groove 3. The height adjustment component 5 facilitates the adjustment of the height of the LED eye chart 1, making it easy to adapt to people of different heights for vision testing. The limiting component 6 facilitates the installation and removal of the LED eye chart 1.

[0026] Please see Figure 2-6 The limiting component 6 includes a circular groove 601, a limiting block 602, a connecting rod 603, a spring 604, and a connecting groove 605. The inner sidewall of the limiting groove 601 is symmetrically provided with circular grooves 601. The limiting block 602 is provided inside the circular groove 601. The connecting rod 603 is fixedly installed on one side of the limiting block 602. One end of the connecting rod 603 extends to the outside of the connecting protrusion 2. The end of the limiting block 602 away from the connecting rod 603 is provided with an arc-shaped surface. The end of the connecting rod 603 extending to the outside of the connecting protrusion 2 is fixedly installed with a connecting end 9. The connecting rod 603 and the connecting end 9 facilitate the movement of the limiting block 602 inside the circular groove 601, which facilitates the subsequent installation and disassembly of the LED vision chart 1.

[0027] Please see Figure 2-6 A spring 604 is provided on the outer surface of the connecting rod 603. One end of the spring 604 is fixed to one side of the limiting plug 602, and the other end of the spring 604 is fixed to the inner wall of the circular groove 601. The inner wall of the connecting plug 4 is symmetrically provided with connecting grooves 605 corresponding to the limiting plug 602. The operator first inserts the connecting plug 4 into the inside of the limiting groove 3. When the connecting plug 4 enters the inside of the limiting groove 3 and contacts the limiting plug 602, since one end of the limiting plug 602 is provided with an arc surface, the limiting plug 602 will move towards the inside of the circular groove 601 when it contacts the connecting plug 4. When the limiting plug 602 corresponds to the connecting groove 605, the limiting plug 602 can enter the inside of the connecting groove 605 under the action of the spring 604 to fix the connecting plug 4 and the connecting protrusion 2, which is convenient for installing the LED vision chart 1. When disassembling, only the connecting rod 603 needs to be pulled.

[0028] Please see Figure 1-5 The height adjustment component 5 includes a fixed rod 501, an adjusting screw 502, a motor 503, and a threaded adjusting block 504. The fixed rod 501 is provided on the rear side of the LED vision chart 1. Multiple mounting plates 7 are symmetrically fixed on the side of the fixed rod 501, and each of the multiple 7 has a mounting hole on one side. Through the multiple mounting plates 7 and mounting holes, it is easy for personnel to use screws to install and fix the fixed rod 501 in a suitable position.

[0029] Please see Figure 1-5 An adjusting screw 502 is provided inside the fixing rod 501. A bearing is fixedly installed on the bottom surface of the fixing rod 501, and the bottom end of the adjusting screw 502 is fixedly installed in the middle of the bearing. The bearing facilitates the adjustment screw 502 to rotate better inside the fixing rod 501.

[0030] Please see Figure 1-5 A motor 503 is fixedly installed on the top surface of the fixed rod 501. The drive end of the motor 503 is fixed to the top end of the adjusting screw 502. A threaded adjusting block 504 is threadedly connected to the outer surface of the adjusting screw 502. The front end of the threaded adjusting block 504 is fixed to one side of the connecting plug 4. The motor 503 facilitates the rotation of the adjusting screw 502, thereby allowing the threaded adjusting block 504 to move up and down inside the fixed rod 501 for easy adjustment of the height of the LED vision chart 1 to accommodate people of different heights. The threaded adjusting block 504 is a rectangular threaded block, which prevents the threaded adjusting block 504 from rotating when moving.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An LED visual acuity chart for ophthalmic examination, comprising an LED visual acuity chart (1), characterized in that: A connecting protrusion (2) is fixedly installed on the rear side of the LED eye chart (1). A limiting groove (3) is opened on the bottom surface of the connecting protrusion (2). A connecting plug (4) is inserted into the limiting groove (3). A height adjustment component (5) connected to the connecting plug (4) is provided on the rear side of the LED eye chart (1). A limiting component (6) connected to the connecting plug (4) is provided inside the limiting groove (3). The limiting component (6) includes a circular groove (601), a limiting plug (602), a connecting rod (603), a spring (604), and a connecting groove (605). The inner sidewall of the limiting groove (3) is symmetrically provided with a circular groove (601). The circular groove (601) is provided with a limiting plug (602) inside. A connecting rod (603) is fixedly installed on one side of the limiting plug (602). One end of the connecting rod (603) extends to the outside of the connecting protrusion (2). A spring (604) is provided on the outer surface of the connecting rod (603). One end of the spring (604) is fixed to one side of the limiting plug (602), and the other end of the spring (604) is fixed to the inner sidewall of the circular groove (601). The inner sidewall of the connecting plug (4) is symmetrically provided with a connecting groove (605) corresponding to the limiting plug (602).

2. The LED visual acuity chart for ophthalmic examination according to claim 1, characterized in that: The height adjustment assembly (5) includes a fixed rod (501), an adjusting screw (502), a motor (503), and a threaded adjusting block (504). The fixed rod (501) is provided on the rear side of the LED vision chart (1). The adjusting screw (502) is provided inside the fixed rod (501). The motor (503) is fixedly installed on the top surface of the fixed rod (501). The driving end of the motor (503) is fixed to the top end of the adjusting screw (502). The threaded adjusting block (504) is threadedly connected to the outer surface of the adjusting screw (502). The front end of the threaded adjusting block (504) is fixed to one side of the connecting plug (4).

3. The LED visual acuity chart for ophthalmic examination according to claim 2, characterized in that: Multiple mounting plates (7) are symmetrically fixedly installed on the side of the fixing rod (501), and mounting holes are opened on one side of each of the multiple (7).

4. The LED visual acuity chart for ophthalmic examination according to claim 3, characterized in that: The bearing is fixedly installed on the inner bottom surface of the fixing rod (501), and the bottom end of the adjusting screw (502) is fixedly installed in the middle of the bearing.

5. An LED visual acuity chart for ophthalmic examination according to claim 4, characterized in that: The LED vision chart (1) has placement tubes (8) fixedly installed on its left and right sides respectively.

6. The LED visual acuity chart for ophthalmic examination according to claim 1, characterized in that: The connecting rod (603) has a connecting end (9) fixedly installed at one end extending to the outside of the connecting protrusion (2).

7. An LED visual acuity chart for ophthalmic examination according to claim 1, characterized in that: The end of the limiting plug (602) away from the connecting rod (603) is provided with an arc-shaped surface.

8. An LED visual acuity chart for ophthalmic examination according to claim 7, characterized in that: The limiting groove (3) is a T-shaped groove, and the connecting plug (4) is a T-shaped block. The limiting groove (3) and the connecting plug (4) are adapted to each other.

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