Anti-memorizing logarithmic visual chart

Abstract

The utility model relates to an anti-memorizing logarithm visual chart, and belongs to the technical field of visual charts. Comprising a base, a lamp box is arranged at the upper end of the base, magnetic attraction columns are arranged at the two ends of one side of the lamp box, the magnetic attraction columns are connected with a circular vision card in a magnetic attraction mode, a limiting mechanism is arranged at the position, located between the two magnetic attraction columns, of the side face of the lamp box, and a connecting frame matched with the limiting mechanism is fixedly connected to the side face of the vision card. And the other side of the lamp box is provided with a placing frame matched with the vision card. By arranging the magnetic attraction column and the circular vision card which are matched with each other, the angle of the vision card can be changed at any time during vision detection, so that the direction of each E in the panel is changed, and the situation that the effectiveness of a measurement result is affected due to the fact that a testee remembers the direction of the E is avoided; by arranging the limiting mechanism, the angle of the vision card is fixed, and the situation that the vision card rotates in the vision detection process is avoided.

Description

Technical Field

[0001] The utility model relates to an anti-memory logarithmic vision chart, belonging to the technical field of vision charts. Background Art

[0002] An eye chart is a tool used to assess and record an individual's vision. It usually consists of a series of letters, numbers, symbols or graphics. These elements are arranged in a certain pattern and are used to accurately measure an individual's ability to identify these elements at a certain distance.

[0003] In the process of manual vision testing, most of the time, an eye chart light box is used to project an image onto a screen to test the patient's myopia. The direction of each "E" in the traditional eye chart light box panel is fixed and cannot be changed. It is easy for patients to remember the direction of the letter "E", affecting the validity of the measurement results. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing eye chart light box panel is fixed and cannot be replaced, and patients are prone to remember the direction of the letter "E", which affects the validity of the measurement results.

[0005] In order to solve the above problems, the utility model provides an anti-memory logarithmic eye chart, comprising a base, a light box is provided at the upper end of the base, magnetic columns are provided at both ends of one side of the light box, and the magnetic columns are magnetically connected to a circular vision card, a limiting mechanism is provided on the side of the light box between the two magnetic columns, a connecting frame adapted to the limiting mechanism is fixedly connected to the side of the vision card, and a placement frame adapted to the vision card is provided on the other side of the light box.

[0006] Further: the limiting mechanism includes a telescopic rod, a spring, a connecting piece, and a limiting rod. The two ends of the telescopic rod are respectively fixedly connected to the connecting piece and the side of the light box. The spring is sleeved on the outside of the telescopic rod. The two ends of the spring are respectively fixedly connected to the connecting piece and the side of the light box. The two limiting rods are fixedly connected to both sides of the connecting piece.

[0007] Furthermore: the connection frame is provided with 8 evenly distributed grooves, and the grooves are adapted to the limiting rods.

[0008] Furthermore: an adjustment button electrically connected to the light box is provided at the upper end of the base.

[0009] Furthermore: a magnetic slot is provided on one side of the vision card, and the magnetic slot is connected to the magnetic column.

[0010] Furthermore: the lower end of the base is provided with evenly distributed support columns.

[0011] Furthermore: the lower end of the placement frame is hollowed out.

[0012] The utility model discloses a kind of anti-memory logarithmic visual acuity tables, including base, lamp box, magnetic attraction column, placement frame, adjusting knob, support column and visual acuity card.

[0013] The patent can change the angle of the visual acuity card at any time when detecting visual acuity, thereby changing the direction of each "E" in the panel, avoiding the situation that the testee remembers the direction of the letter "E" and affects the effectiveness of the measurement result.

[0014] By setting the limiting mechanism, the angle of the visual acuity card is fixed, avoiding the situation that the visual acuity card rotates during the visual acuity detection process. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, together with the embodiments of the utility model, to explain the utility model, and do not constitute a limitation on the utility model. In the drawings:

[0016] Figure 1 The utility model discloses a kind of anti-memory logarithmic visual acuity tables Figure 1 .

[0017] Figure 2 The utility model discloses a kind of anti-memory logarithmic visual acuity tables Figure 2 .

[0018] Figure 3 The utility model discloses a kind of anti-memory logarithmic visual acuity tables.

[0019] Figure 4 The utility model discloses a kind of anti-memory logarithmic visual acuity tables.

[0020] In the drawings:

[0021] 1, base; 11, lamp box; 12, magnetic attraction column; 13, placement frame; 14, adjusting knob; 15, support column; 2, visual acuity card; 21, connecting frame; 22, groove; 3, limiting mechanism; 31, telescopic rod; 32, spring; 33, connecting piece; 34, limiting rod. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] In conjunction with the drawings Figure 1-4The utility model provides a kind of prevent memory logarithm optotypes, including base 1, the base 1 lower end is equipped with the support column 15 of uniform distribution and the base 1 is supported, the base 1 upper end is equipped with light box 11, the base 1 upper end is equipped with the adjusting knob 14 of electric connection with light box 11, for adjusting light brightness, light box 11 one side both ends are equipped with magnetic attraction column 12, magnetic attraction column 12 is magnetically connected with the round optotypes card 2, optotypes card 2 one side is equipped with magnetic attraction groove, magnetic attraction groove and magnetic attraction column 12 are connected, different optotypes card 2 is equipped with different quantity and different direction letter "E", when carrying out visual acuity test, optotypes card 2 can be rotated on magnetic attraction column 12, the direction of letter "E" on optotypes card 2 is changed and then measured, so as to avoid the effectiveness of measurement result being influenced by the direction of letter "E" remembered by the person being tested;

[0024] Limiting mechanism 3 is equipped with limiting rod 34 between the two magnetic attraction columns 12 on the side of light box 11, limiting mechanism 3 includes telescopic rod 31, spring 32, connecting piece 33, limiting rod 34, the both ends of telescopic rod 31 are fixedly connected with connecting piece 33 and the side of light box 11 respectively, spring 32 is sleeved on the outside of telescopic rod 31, the both ends of spring 32 are fixedly connected with connecting piece 33 and the side of light box 11 respectively, the two limiting rods 34 are fixedly connected on the both sides of connecting piece 33, the side of optotypes card 2 is fixedly connected with the connecting frame 21 adapted to limiting mechanism 3, the connecting frame 21 is equipped with 8 evenly distributed grooves 22, the groove 22 is adapted to limiting rod 34, when needing to rotate optotypes card 2, first pull connecting piece 33 to make telescopic rod 31 extend, make limiting rod 34 move out of the groove 22 of connecting frame 21, then rotate optotypes card 2 to appropriate angle, release connecting piece 33, connecting piece 33 drives telescopic rod 31 to contract under the action of spring 32, limiting rod 34 enters the corresponding groove 22, and the angle of optotypes card 2 is fixed, to avoid that optotypes card 2 rotates in the process of visual acuity detection;

[0025] The other side of light box 11 is equipped with the placing frame 13 adapted to optotypes card 2, for storing excess optotypes card 2, the lower end of placing frame 13 is hollow, to facilitate optotypes card 2 to be pushed out from the lower end of preventing frame and taken.

[0026] The working principle of the present application is:

[0027] When conducting a vision test, first pull the connecting piece 33 to extend the telescopic rod 31, so that the limit rod 34 moves out of the groove 22 of the connecting frame 21, then rotate the vision card 2 to a suitable angle, loosen the connecting piece 33, and under the action of the spring 32, the connecting piece 33 drives the telescopic rod 31 to contract, and the limit rod 34 enters the corresponding groove 22 to fix the angle of the vision card 2 to prevent the vision card 2 from rotating during the vision test. The connecting frame 21 is provided with 8 evenly distributed grooves 22 to facilitate fixing the vision card 2 at 8 different angles, making the measurement content more diverse. The measurement is performed after changing the direction of the letter "E" on the vision card 2, thereby avoiding the situation where the test subject remembers the direction of the letter "E" and affects the validity of the measurement results.

[0028] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. An anti-memory logarithmic eye chart, comprising a base (1), wherein a light box (11) is provided at the upper end of the base (1), characterized in that: The light box (11) is provided with magnetic columns (12) at both ends of one side, and the magnetic columns (12) are magnetically connected to a circular vision card (2). A limiting mechanism (3) is provided on the side of the light box (11) between the two magnetic columns (12), and a connecting frame (21) adapted to the limiting mechanism (3) is fixedly connected to the side of the vision card (2). The other side of the light box (11) is provided with a placement frame (13) adapted to the vision card (2).

2. The anti-memory logarithmic visual acuity chart according to claim 1, characterized in that: The limiting mechanism (3) comprises a telescopic rod (31), a spring (32), a connecting piece (33), and a limiting rod (34); two ends of the telescopic rod (31) are respectively fixedly connected to the connecting piece (33) and the side of the light box (11); the spring (32) is sleeved on the outside of the telescopic rod (31); two ends of the spring (32) are respectively fixedly connected to the connecting piece (33) and the side of the light box (11); and the two limiting rods (34) are fixedly connected to both sides of the connecting piece (33).

3. The anti-memory logarithmic visual acuity chart according to claim 2, characterized in that: The connection frame (21) is provided with 8 evenly distributed grooves (22), and the grooves (22) are adapted to the limiting rods (34).

4. The anti-memory logarithmic visual acuity chart according to claim 1, characterized in that: An adjustment button (14) electrically connected to the light box (11) is provided at the upper end of the base (1).

5. The anti-memory logarithmic visual acuity chart according to claim 1, characterized in that: A magnetic attraction groove is provided on one side of the vision card (2), and the magnetic attraction groove is connected to the magnetic attraction column (12).

6. The anti-memory logarithmic visual acuity chart according to claim 1, characterized in that: The lower end of the base (1) is provided with evenly distributed support columns (15).

7. The anti-memory logarithmic visual acuity chart according to claim 1, characterized in that: The lower end of the placement frame (13) is hollowed out.

Images