Height-adjustable vision examination device

Abstract

The utility model belongs to the technical field of vision examination, and particularly relates to a height-adjustable vision examination device which comprises a visual chart and at least two fixing supports, the fixing supports are installed on the vertical face behind the visual chart in parallel, and a transverse first support is fixedly arranged between the two fixing supports. A sliding rail corresponding to the fixing support is arranged on the rear surface of the visual chart, a sliding way is formed in the surface of the side, close to the fixing support, of the sliding rail, a sliding block is fixedly arranged on the side, close to the sliding rail, of the fixing support, and the sliding block extends into the sliding way and is in sliding connection with the sliding rail. The visual chart is manually or electrically adjusted, so that the height of the visual chart can be adjusted according to the eye height of a testee, the requirements of different testees are met, and the accuracy and comfort of vision detection are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to visual inspection technical field, concretely relates to a height adjustable visual inspection device. BACKGROUND

[0002] The visual acuity chart is a chart for measuring visual acuity, which is made according to the principle of visual angle, and the so-called visual angle is the included angle formed by the light rays emitted from two points in the outside world through the eye node (that is, the angle formed when the light rays of two points of the outside object enter the eye and intersect).

[0003] Under normal circumstances, the minimum distance between two points that can be distinguished by the human eye forms a minimum visual angle, that is, a minute visual angle. The visual acuity chart is designed to effectively detect visual acuity in units of a minute visual angle.

[0004] The existing visual inspection chart is often fixed on the wall surface and cannot be adjusted according to the eye height of the tester, so that the tester cannot look straight, which affects the accuracy of detection and the comfort of the tester. INVENTION CONTENTS

[0005] The utility model aims at providing a height adjustable visual inspection device, overcoming the shortcomings of the prior art, driving the visual inspection chart to rise and fall by manual or electric mode, meeting the needs of testers with different eye heights, and improving the accuracy and comfort of visual inspection.

[0006] To solve the above problems, the technical scheme adopted by the utility model is as follows:

[0007] A height adjustable visual inspection device, comprising a visual acuity chart and a fixed support, the fixed support is provided with at least two, and the fixed support is installed in parallel on the vertical surface behind the visual acuity chart, and a transverse first support is fixed between the two fixed supports;

[0008] The rear surface of the visual acuity chart is provided with a slide rail corresponding to the fixed support, the surface of the slide rail close to the fixed support is provided with a slide, the side of the fixed support close to the slide rail is fixedly provided with a sliding block, the sliding block extends into the slide, and the sliding block is in sliding connection with the slide rail.

[0009] Further, one side of the visual acuity chart is provided with a limiting mechanism for fixing the position of the visual acuity chart.

[0010] Further, the limiting mechanism comprises a positioning iron block and an electromagnet, the positioning iron block is fixedly installed on one side of the slide rail, and the electromagnet is fixedly installed on the outside of the visual acuity chart, and the surface of the side of the electromagnet close to the visual acuity chart is in contact with the surface of the positioning iron block.

[0011] Further, a driving mechanism for driving the visual acuity chart to move along the length direction of the fixed support is arranged between the fixed supports.

[0012] Further, the driving mechanism comprises a driving motor, a driving screw rod and a moving block, one end of the driving motor is connected with the driving screw rod, the driving screw rod penetrates through the moving block and is threadedly connected with the moving block, and the moving block is fixedly connected with the rear surface of the visual chart.

[0013] Further, the second support and the third support are respectively arranged on the two sides of the first support in parallel, two ends of the second support and the third support are respectively connected with the two fixed supports, the driving motor is installed on the second support, and one end of the driving screw rod, away from the driving motor, is rotationally connected with the third support.

[0014] Further, the sliding rods are arranged on the two sides of the driving screw rod in parallel, the sliding rods penetrate through the moving block, and two ends of the sliding rods are fixedly connected with the second support and the third support.

[0015] Further, the front end surface of the visual chart is provided with an indicating line for indicating eye height, and the bottom of the front end surface of the visual chart is provided with a laser emitter.

[0016] Compared with the prior art, the visual inspection device has the following beneficial effects:

[0017] The visual inspection device with adjustable height can adjust the height of the visual chart according to the eye height of the tester in a manual or electric mode, meets the needs of different testers, and improves the accuracy and comfort of visual inspection. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of a visual inspection device with adjustable height.

[0019] Figure 2 It is a structural schematic view of the limiting mechanism in embodiment 1.

[0020] Figure 3 It is a structural schematic view of the driving mechanism in embodiment 2.

[0021] In the figure: 1, visual chart; 2, fixed support; 3, limiting mechanism; 4, laser emitter; 5, indicating line; 6, first support; 7, positioning iron block; 8, electromagnet; 9, sliding rail; 10, second support; 11, driving motor; 12, third support; 13, driving screw rod; 14, sliding rod; 15, moving block. DETAILED DESCRIPTION

[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] Example 1

[0024] like Figures 1-2 As shown, this embodiment discloses an adjustable-height vision testing device, including a vision chart 1 and a fixed bracket 2. At least two fixed brackets 2 are provided, and the fixed brackets 2 are installed parallel to each other on the vertical surface behind the vision chart 1. A first horizontal bracket 6 is fixed between the two fixed brackets 2.

[0025] The back surface of the eye chart 1 is provided with a slide rail 9 corresponding to the fixed bracket 2. A slide channel is opened on the side surface of the slide rail 9 near the fixed bracket 2. A slider is fixed on the side of the fixed bracket 2 near the slide rail 9. The slider extends into the slide channel and is slidably connected to the slide rail 9.

[0026] In order to fix the position of the eye chart 1, a limiting mechanism 3 for fixing the position of the eye chart 1 is provided on one side of the eye chart 1. The limiting mechanism 3 includes a positioning iron block 7 and an electromagnet 8. The positioning iron block 7 is fixedly installed on one side of the slide rail 9, and the electromagnet 8 is fixedly installed on the outside of the eye chart 1. The surface of the electromagnet 8 near the eye chart 1 is in contact with the surface of the positioning iron block 7.

[0027] In the initial state, the electromagnet 8 is energized to generate magnetic attraction, which attracts the positioning iron block 7 to adhere and fix the height of the eye chart 1. When adjustment is needed, the electromagnet 8 is de-energized, and the eye chart 1 is manually adjusted to rise / fall. Once the desired height is reached, the electromagnet 8 is energized again to fix the position of the eye chart 1, and then the vision test is performed.

[0028] The front side of the visual acuity chart 1 has an indicator line 5 for indicating eye height, and a laser emitter 4 is installed at the bottom of the front side of the visual acuity chart 1. The indicator line 5 can be aligned with the eye height of the test subject by raising and lowering it. To improve the accuracy of the indicator line 5, a height ruler can be installed on one side of the indicator line 5. After measuring the eye height of the test subject, the indicator line 5 can be adjusted to the same height position. The laser line emitted by the laser generator can mark the detection position, indicating that the test subject sits at the laser line position for detection, thereby improving the accuracy of the detection.

[0029] Example 2

[0030] like Figure 3Compared with the embodiment 1, the embodiment shown has the difference that the embodiment does not use the limiting mechanism 3, but sets the driving mechanism for driving the visual chart 1 to move along the length direction of the fixed support 2 between the fixed supports 2.

[0031] The driving mechanism comprises a driving motor 11, a driving screw rod 13 and a moving block 15, the output end of the driving motor 11 is connected with one end of the driving screw rod 13, the driving screw rod 13 penetrates through the moving block 15 and is threadedly connected with the moving block 15, and the moving block 15 is fixedly connected with the rear surface of the visual chart 1.

[0032] In order to improve the stability of the structure of the device, the second support 10 and the third support 12 are respectively arranged in parallel on the two sides of the first support 6, the two ends of the second support 10 and the third support 12 are respectively connected with the two fixed supports 2, the driving motor 11 is installed on the second support 10, and the end of the driving screw rod 13, which is away from the driving motor 11, is rotationally connected with the third support 12.

[0033] In order to improve the stability of the sliding, the slide rods 14 are arranged in parallel on the two sides of the driving screw rod 13, the slide rods 14 penetrate through the moving block 15, and the two ends of the slide rods 14 are respectively fixedly connected with the second support 10 and the third support 12.

[0034] When the height of the visual chart 1 needs to be adjusted, the driving motor 11 is controlled to rotate by the controller, the driving screw rod 13 is driven to rotate, the moving block 15 is driven to move along the length direction of the driving screw rod 13 by the thread connection between the driving screw rod 13 and the moving block 15, and the visual chart 1 is driven to ascend or descend to the required position.

[0035] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point, the embodiments should be regarded as exemplary and non-restrictive, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all the changes falling within the meaning and scope of the equivalent elements of the claims should be included in the utility model. Any figure mark in the claims should not be regarded as limiting the involved claims.

Claims

1. An adjustable height vision testing device, characterized by: It includes a visual chart (1) and fixing supports (2), the fixing supports (2) are provided with at least two, and the fixing supports (2) are installed on the vertical plane behind the visual chart (1) in parallel, and a transverse first support (6) is fixed between the two fixing supports (2); The rear surface of the visual chart (1) is provided with a slide rail (9) corresponding to the fixing support (2), the side surface of the slide rail (9) close to the fixing support (2) is provided with a slide channel, the fixing support (2) close to the slide rail (9) is fixedly provided with a sliding block, the sliding block extends into the slide channel and is in sliding connection with the slide rail (9).

2. An adjustable height vision testing device according to claim 1, wherein: One side of the visual chart (1) is provided with a limiting mechanism (3) for fixing the position of the visual chart (1).

3. An adjustable height vision testing device according to claim 2, wherein: The limiting mechanism (3) comprises a positioning iron block (7) and an electromagnet (8), the positioning iron block (7) is fixedly installed on one side of the slide rail (9), and the electromagnet (8) is fixedly installed on the outside of the visual chart (1), and the side surface of the electromagnet (8) close to the visual chart (1) is in contact with the surface of the positioning iron block (7).

4. The height adjustable vision testing device of claim 1, wherein: Driving mechanisms are arranged between the fixing supports (2) for driving the visual chart (1) to move along the length direction of the fixing supports (2).

5. An adjustable height vision testing device according to claim 4, wherein: The driving mechanism comprises a driving motor (11), a driving screw rod (13) and a moving block (15), one end of the driving screw rod (13) is connected with the output end of the driving motor (11), the driving screw rod (13) penetrates through the moving block (15) and is in threaded connection with the moving block (15), and the moving block (15) is fixedly connected with the rear surface of the visual chart (1).

6. An adjustable height vision testing device according to claim 5, wherein: Second supports (10) and third supports (12) are arranged on the two sides of the first support (6) in parallel, respectively, and the two ends of the second supports (10) and the third supports (12) are connected with the two fixing supports (2), respectively, the driving motor (11) is installed on the second support (10), and one end of the driving screw rod (13) away from the driving motor (11) is rotatably connected with the third support (12).

7. An adjustable height vision testing device according to claim 6, wherein: Sliding rods (14) are arranged on the two sides of the driving screw rod (13) in parallel, the sliding rods (14) penetrate through the moving block (15) and are fixedly connected with the second support (10) and the third support (12) at two ends, respectively.

8. An adjustable height vision testing device according to claim 1, wherein: An indicating line (5) for indicating eye height is arranged on one side of the front end surface of the visual chart (1), and a laser emitter (4) is installed at the bottom of the front end surface of the visual chart (1).

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