Myopia prevention and control visual chart

Abstract

The myopia prevention and control visual chart comprises a bearing base, an electric telescopic rod is fixedly arranged on the upper surface of the bearing base, a myopia prevention and control lamp is inserted into the output end of the electric telescopic rod, a protruding block is fixedly arranged at the top end of the output end of the electric telescopic rod, and a light adjusting knob is arranged on the upper surface of the myopia prevention and control lamp. A groove is formed in the bottom face of the myopia prevention and control lamp, the myopia prevention and control lamp comprises a lampshade, the upper face and the lower face of the lampshade are fixedly connected with an upper cover plate and a lower cover plate through bolts, visual charts are dispersed on the outer surface through the lampshade, the visual charts are prevented from being concentrated on one face, the structure is simple and convenient, home use is convenient, and vision changes of students can be monitored at any time; the visual chart is simple in structure and convenient to carry, the light intensity can be adjusted through the light adjusting knob, bright environment vision and dark environment vision are set, the defect of a single high-contrast visual chart in the market at present is overcome, and the defect of myopia prevention and control is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of myopia prevention and control, and in particular to a myopia prevention and control vision chart. Background Art

[0002] The eye chart is a pattern used to test vision, which can be divided into near vision chart and far vision chart. When conducting a vision test, the eye chart needs to be installed on a light box, and the light source on the light box needs to provide sufficient lighting to identify the pattern on the eye chart.

[0003] The existing eye chart is installed on one surface of the light box as a whole, which results in a large area and increased weight of the light box. It is suitable for use in ophthalmology hospitals or optical shops. For home use, the existing eye chart is large and bulky, difficult to install at home, and unsuitable for home use and carrying. Summary of the invention

[0004] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide a myopia prevention and control vision chart.

[0005] The technical solution of the present invention is as follows: a myopia prevention and control visual acuity chart comprises a bearing base, an electric telescopic rod is fixedly provided on the upper surface of the bearing base, a myopia prevention and control lamp is inserted into the output end of the electric telescopic rod, a convex block is fixedly provided on the top of the output end of the electric telescopic rod, a light adjustment knob is provided on the upper surface of the myopia prevention and control lamp, and a groove is provided on the bottom surface of the myopia prevention and control lamp;

[0006] The myopia prevention and control lamp comprises a lampshade, the upper and lower surfaces of the lampshade are fixedly connected to an upper cover plate and a lower cover plate by bolts, a visual acuity chart is provided on the surface of the lampshade, and a power connection line is provided on one side of the lower cover plate;

[0007] An LED lamp tube is arranged inside the myopia prevention and control lamp, a power control terminal is arranged below the LED lamp tube, a variable resistor dimming circuit is arranged above the LED lamp tube, and the light adjustment knob is electrically connected to the variable resistor dimming circuit.

[0008] As a preferred implementation, the LED lamp tube is vertically installed in the center of the lampshade.

[0009] As a preferred implementation manner, the myopia prevention and control lamp is made of transparent material.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are that the eye chart is dispersed on the outer surface through the lampshade to avoid the eye chart being concentrated on one side. The structure is simple and convenient, easy for home use, and can monitor students' vision changes at any time. It is also convenient to carry, and the light intensity can be adjusted through the light adjustment knob to set the vision in bright environment and dark environment, thus solving the shortcomings of the single high-contrast eye chart on the market and making up for the shortcomings of myopia prevention and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The overall structural schematic diagram of the myopia prevention and control vision chart provided by the present invention;

[0012] Figure 2 A schematic diagram of the structure of a myopia prevention and control lamp for providing a myopia prevention and control visual acuity chart for the present invention;

[0013] Figure 3 A schematic diagram of the convex structure of the myopia prevention and control vision chart provided for the present invention;

[0014] Figure 4 A schematic diagram of the bottom structure of a myopia prevention and control lamp for providing a myopia prevention and control visual acuity chart for the present invention;

[0015] Figure 5 A schematic diagram of the internal structure of a myopia prevention and control lamp of the myopia prevention and control visual acuity chart is provided for the present invention.

[0016] Legend: 1. Carrying base; 2. Electric telescopic rod; 3. Myopia prevention and control lamp; 31. Lampshade; 32. Upper cover; 33. Lower cover; 34. Power connection line; 4. Bump; 5. Light adjustment knob; 6. Groove; 7. LED lamp tube; 8. Power control terminal; 9. Rheostat dimming circuit. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Example

[0022] The myopia prevention and control eye chart comprises a bearing base 1, an electric telescopic rod 2 is fixedly provided on the upper surface of the bearing base 1, a myopia prevention and control lamp 3 is inserted into the output end of the electric telescopic rod 2, a protrusion 4 is fixedly provided on the top of the output end of the electric telescopic rod 2, a light adjustment knob 5 is provided on the upper surface of the myopia prevention and control lamp 3, and a groove 6 is provided on the bottom surface of the myopia prevention and control lamp 3; the height of the myopia prevention and control lamp 3 is adjusted by using the electric telescopic rod 2, which can be suitable for people of different heights, and the electric telescopic rod 2 can be separated from the myopia prevention and control lamp 3, which is convenient for carrying the myopia prevention and control lamp 3 separately, and when vision testing is needed, the brightness can be adjusted by the light adjustment knob 5, which can be manually adjusted according to the surrounding light;

[0023] The myopia prevention and control lamp 3 includes a lampshade 31, and the upper and lower surfaces of the lampshade 31 are fixedly connected to an upper cover plate 32 and a lower cover plate 33 by bolts. A vision chart is provided on the surface of the lampshade 31, and a power connection line 34 is provided on one side of the lower cover plate 33; the vision chart is distributed on the four surfaces of the lampshade 31, which reduces the area occupied by the vision chart on the same surface, so that the vision chart is concentrated on the lampshade 31, which is easy to carry and suitable for home use, and the vision of students can be monitored at any time;

[0024] An LED lamp tube 7 is provided inside the myopia prevention and control lamp 3, and a power control terminal 8 is provided below the LED lamp tube 7. The control button of the power control terminal 8 is on one side of the lower cover plate 33, which is convenient for starting and shutting down the LED lamp tube 7. A rheostat dimming circuit 9 is provided above the LED lamp tube 7, and the light adjustment knob 5 is electrically connected to the rheostat dimming circuit 9. As the light adjustment knob 5 is rotated, the resistance of the LED lamp tube 7 in the rheostat dimming circuit 9 will change, thereby adjusting the light brightness.

[0025] The LED lamp tube 7 is installed vertically at the center of the lampshade 31. During detection, the LED lamp tube 7 is installed vertically so that the light source of the LED lamp tube 7 is at the same distance from the four sides of the lampshade 31, which can ensure that the light source intensity on the four sides of the lampshade 31 is consistent and facilitates detection. The myopia prevention and control lamp is made of transparent material, which can transmit the light of the LED lamp tube 7 and make the eye chart display clear.

[0026] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A myopia prevention and control visual acuity chart, comprising a supporting base (1), characterized in that: An electric telescopic rod (2) is fixedly provided on the upper surface of the bearing base (1); a myopia prevention and control lamp (3) is inserted into the output end of the electric telescopic rod (2); a protrusion (4) is fixedly provided on the top of the output end of the electric telescopic rod (2); a light adjustment knob (5) is provided on the upper surface of the myopia prevention and control lamp (3); and a groove (6) is provided on the bottom surface of the myopia prevention and control lamp (3); The myopia prevention and control lamp (3) comprises a lampshade (31), the upper and lower surfaces of the lampshade (31) are fixedly connected to an upper cover plate (32) and a lower cover plate (33) by bolts, a visual acuity chart is provided on the surface of the lampshade (31), and a power connection line (34) is provided on one side of the lower cover plate (33); The myopia prevention and control lamp (3) is provided with an LED lamp tube (7) inside, a power control terminal (8) is provided below the LED lamp tube (7), a variable resistor dimming circuit (9) is provided above the LED lamp tube (7), and the light adjustment knob (5) is electrically connected to the variable resistor dimming circuit (9).

2. The myopia prevention and control visual acuity chart according to claim 1, characterized in that: The LED lamp tube (7) is installed vertically at the center of the lampshade (31).

3. The myopia prevention and control visual acuity chart according to claim 1, characterized in that: The myopia prevention and control lamp is made of transparent material.

Images