Vision screening instrument

Abstract

The utility model discloses a vision screening instrument, which belongs to the technical field of vision detection devices and comprises a sleeve, a light source, a reflecting device and a camera, the light source, the reflecting device and the camera are all mounted in the sleeve, and the camera is mounted in the sleeve only through one mounting point. The position of the camera in the sleeve can be finely adjusted, and an adjusting mechanism for adjusting the position of the camera in the sleeve is arranged in the sleeve; the light reflected by the light source after passing through the reflecting device just enters the center of the camera when the camera is in the use position; during use, the light source is turned on, and whether the camera is in a use position can be judged by observing whether reflected light enters the center of the camera; when the position of the camera is adjusted, the light source is kept on normally, the adjusting mechanism is operated until the reflected light can enter the center of the camera, and the judgment and adjustment modes are simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of vision testing device technology, and in particular to a vision screening instrument. Background Technology

[0002] The vision screening instrument consists of a sleeve (dark chamber) and a camera. The camera is a separate component, installed inside the sleeve base, and its position (angle) is adjustable. For ease of disassembly, it is fixed at only one point. Therefore, during production and transportation, the camera position may change, leading to reduced detection accuracy or even malfunction of the device. The current adjustment procedure typically involves connecting the device to a tablet via Bluetooth after startup, then opening the app to take a picture of the user's eye. The image is then viewed in the app to determine if it meets the requirements. This check must be performed before each test to verify if the camera position has changed and if the deviation is within the allowable range. If the camera position has changed or is outside the allowable range, manual adjustment is required. Based on experience, after adjusting the camera to a certain angle, another picture needs to be taken to verify its functionality, making the operation rather cumbersome.

[0003] How to design a vision screening device that can conveniently check the position of the camera is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies in the existing technology by providing a vision screening device that can determine whether the camera is in use by observing whether the reflected light enters the center of the camera. The operation is relatively simple and convenient.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a vision screening device, including a sleeve, a light source, a reflector, and a camera. The light source, the reflector, and the camera are all installed inside the sleeve, and the camera is installed inside the sleeve through only one mounting point. The position of the camera inside the sleeve is adjustable, and the sleeve is provided with an adjustment mechanism for adjusting the position of the camera inside the sleeve.

[0007] The reflected light from the light source, after passing through the reflector, shines precisely into the center of the camera when it is in the usage position.

[0008] Preferably, the sleeve has a platform inside, the platform has a horizontal surface and a vertical surface, the camera is placed on the platform, and the adjustment mechanism is provided between the camera and the horizontal surface, and the camera is fixedly connected to the vertical surface by fasteners.

[0009] Preferably, the adjustment mechanism is a height-adjustable knob.

[0010] Preferably, the knob includes a support head and a connecting post, the support head abutting against the camera, and the connecting post being threadedly connected to the platform.

[0011] Preferably, the sleeve has a rear cover, which is detachably connected to the sleeve, and the camera is positioned between the rear cover and the sleeve.

[0012] Preferably, the knob is completely located inside the sleeve.

[0013] Preferably, the end of the knob away from the camera extends to the outside of the sleeve.

[0014] Preferably, the reflecting device includes a reflector and a bracket installed inside the sleeve, wherein the reflector is mounted on the bracket.

[0015] Preferably, the light-emitting area of ​​the light source is located in the central region of the light source.

[0016] Preferably, the camera uses infrared imaging technology; the reflector is a semi-reflective, semi-transparent reflector.

[0017] The present invention achieves the following beneficial effects compared to the prior art:

[0018] This invention utilizes a light source and a reflective device inside the sleeve of the vision screening device. The reflected light is directed to the center of the camera when it is in the "use" position, thus determining whether the camera is in the "use" position. If the reflected light reaches the center of the camera, it is in the "use" position; otherwise, it is not. Compared to existing technologies that require starting the device, taking a picture with an app, and then viewing the image in the app to determine if it meets requirements, this invention offers a simpler and more convenient method.

[0019] In addition, the sleeve is equipped with an adjustment mechanism for adjusting the camera position. When adjusting the camera position, keep the light source constantly on and operate the adjustment mechanism to continuously adjust the camera position until the center of the camera coincides with the reflected light. This eliminates the need to repeatedly take pictures and judge the photos, and the operation is relatively simple. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the vision screening device disclosed in a specific embodiment of the present utility model.

[0022] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0023] Figure 3 for Figure 1 A schematic diagram of the vision screening device when the back cover is opened;

[0024] Figure 4 This is a schematic diagram of the exploded structure of the back cover and sleeve;

[0025] Figures 5 to 8 The diagrams illustrate camera adjustment methods, where 5a, 6a, 7a, and 8a are photos of human eyes taken by the app; and 5b, 6b, 7b, and 8b are diagrams illustrating camera adjustment methods.

[0026] Among them, 1. Sleeve; 2. Light source; 3. Reflector; 4. Bracket; 5. Camera; 6. Platform; 61. Horizontal surface; 62. Vertical surface; 7. Knob; 71. Knob A; 72. Knob B; 8. Camera mount; 9. Back cover; 10. Threaded connector; 11. Elastic support. Detailed Implementation

[0027] 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.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 4As shown, this utility model provides a vision screening device, including a sleeve 1, a light source 2, a reflector, and a camera 5. The light source 2, reflector, and camera 5 are all installed inside the sleeve 1, with the camera 5 installed through only one mounting point. The position of the camera 5 within the sleeve 1 is fine-tunable, and the sleeve 1 is equipped with an adjustment mechanism for adjusting the position of the camera 5. The reflected light from the light source 2, after passing through the reflector, precisely enters the center of the camera 5 when it is in the "use" position. The "use" position refers to the position of the camera 5 when the vision screening device is functioning normally, where the captured image is located in the center of the screen. If the captured image is near the top, bottom, left, or right of the screen, the camera 5 is in the "non-use" position. To check if the camera 5 is in the "use" position within the sleeve 1, the light source 2 is turned on, and it is observed whether the reflected light enters the center of the camera 5. If so, the camera 5 is in the "use" position; otherwise, it is in the "non-use" position. When the camera 5 is in the "non-use" position, the light source 2 is kept constantly lit, and the adjustment mechanism is manipulated to adjust the position of the camera 5 until the reflected light enters the center of the camera 5. Compared to the existing technology that involves starting the device, taking a picture with the human eye via an APP, and then viewing the picture in the APP to determine whether the camera 5 is in use, the method provided by this utility model is simpler, more convenient, and easier to operate.

[0030] The sleeve 1 has a platform 6 inside, which has a horizontal surface 61 and a vertical surface 62. The camera 5 is placed on the platform 6, and an adjustment mechanism is provided between the camera 5 and the horizontal surface 61. The camera 5 is fixedly connected to the vertical surface 62 by fasteners. The fasteners can be snap-fit, threaded connectors, etc. In an exemplary embodiment, the fastener is a threaded connector 10. The vertical surface 62 of the platform 6 has a notch, and a camera mounting bracket 8 is provided at the notch. Both the camera mounting bracket 8 and the side of the camera 5 have threaded holes. The threaded connector 10 passes through the threaded holes on the camera 5 and the camera mounting bracket 8 in sequence to fix the camera 5 inside the sleeve 1, wherein the camera mounting bracket 8 is a metal bracket.

[0031] The adjustment mechanism is a height-adjustable knob 7. Knob 7 includes a support head and a connecting post. The support head abuts against the camera 5, and the connecting post is threadedly connected to the platform 6. Two knobs 7 are located between the camera 5 and the horizontal surface 61, and both knobs 7 are on the same side. Taking one knob 7 as knob A 71 and the other as knob B 72 as an example, the camera adjustment method is explained (the positions of knobs A 71 and B 72 are detailed in [link to documentation]). Figures 5 to 8 When the camera angle is too high, the resulting image will be closer to the bottom of the screen (e.g., ...). Figure 5 If 5a), then rotate knob A 71 to the right (as shown in the image). Figure 5 (5b); When the camera angle is too low, the resulting image will be closer to the top of the screen (e.g., ...). Figure 6If 6a), then rotate knob A 71 to the left (as shown in the image). Figure 6 (6b). When the camera is tilted to the left at angle 5, the resulting image will be closer to the right side of the screen (e.g., ...). Figure 7 If 7a), then rotate knob B 72 to the right (as shown in the image). Figure 7 (7b); When the camera is tilted to the right at angle 5, the resulting image will be closer to the left side of the screen (e.g., ...). Figure 8 If 8a), then rotate knob B 72 to the left (as shown in the image). Figure 8 (8b). Rotating to the left increases the height of knob 7, and rotating to the right decreases the height of knob 7. In 5a, 6a, 7a, and 8a, the border outside the human eye represents the border of the screen.

[0032] The sleeve 1 has a rear cover 9, which is detachably connected to the sleeve 1. The camera 5 is placed in the internal area between the rear cover 9 and the sleeve 1. The camera 5 can be installed or replaced by opening the rear cover 9. The connection between the rear cover 9 and the sleeve 1 can be by fastening, screwing, snapping, etc. In an exemplary embodiment, one end of the rear cover 9 is hinged to the sleeve 1, and the other end of the rear cover 9 is fastened to the sleeve 1. Furthermore, an elastic support 11 is provided on the side of the rear cover 9 facing the camera 5. After the rear cover 9 is fastened, the elastic support 11 presses against the edge of the camera 5 screen to compress the camera 5. The elastic support 11 and the knob 7 are arranged in a staggered manner to improve the stability of the camera 5 position.

[0033] If the knob 7 is completely inside the sleeve 1, the rear cover 9 must be opened first to expose the knob 7 before adjusting the position of the camera 5; if the end of the knob 7 away from the camera 5 extends to the outside of the sleeve 1, the position of the camera 5 can be adjusted without opening the rear cover 9. In an exemplary embodiment, the knob 7 is completely inside the sleeve 1.

[0034] The reflecting device includes a reflector 3 and a bracket 4 installed inside the sleeve 1. The reflector 3 is mounted on the bracket 4. The angle at which the reflector 3 is mounted on the bracket 4 is calculated in advance so that the light emitted by the light source 2 is reflected by the reflector 3 and enters the center of the camera 5 when it is in the use position.

[0035] Light source 2 is circular in shape and mainly consists of a lithium battery, control board, light guide column, and outer shell. The light-emitting area is located at the center of the circle. Because it is centered, there is no need to consider the projection angle of light source 2 during installation, making it convenient, quick, and eliminating the need for debugging. Light source 2 has a TYPE-C charging port, a charging indicator light, and a light source power switch on the outside. Light source 2 has the following features:

[0036] 1. It uses a TYPE-C interface for charging (5V) and has a charging indicator light (red and green). A full charge can last for 30 days.

[0037] 2. Single-button control, simple operation: Only one control button is set. By pressing the button, the state of the LED can be cycled (4 states: constant on, fast flash (5.6Hz), slow flash (2.8Hz), and constant off). During the operation of the vision screening instrument, light source 2 is set to the on state, that is, any one of constant on, fast flash, and slow flash, in order to better attract the patient's attention and reduce the NA (no result) rate.

[0038] 3. It can be disassembled and installed without the need for other tools. The overall structure is circular, with the light-emitting area at the center point, and the installation angle does not need to be considered. In an exemplary embodiment, the side wall of the sleeve 1 is provided with a light source mounting hole, and the light source 2 is snapped into the light source mounting hole.

[0039] 4. Consider the application scenario's requirements for brightness, color sensitivity, projection distance, and projection accuracy, select appropriate LED light sources and colors, and use light guide columns to achieve precise projection.

[0040] 5. The technical parameters of light source 2 are as follows:

[0041] Operating voltage: 2V~5.5V;

[0042] Static current: 1uA;

[0043] Drive current: 30–80 mA;

[0044] Light source intensity: 180–400 mcd;

[0045] Main wavelength: 520–537.5 nm;

[0046] Half-wavelength: 30nm.

[0047] Camera 5 uses infrared imaging technology to create images using infrared light, making it suitable for low-light, dark environments. Light source 2 is a point light source, and reflector 3 is a semi-reflective and semi-transparent reflector. Light source 2 is refracted by the semi-reflective and semi-transparent reflector and does not enter camera 5, so that the detection environment inside sleeve 1 is not affected (i.e., there is no polluting light).

[0048] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vision screening instrument, characterized by: The sleeve, light source, reflecting device and camera are all installed in the sleeve, and the camera is installed in the sleeve through only one mounting point, the position of the camera in the sleeve can be finely adjusted, and the adjusting mechanism for adjusting the position of the camera in the sleeve is arranged in the sleeve. The reflected light of the light source through the reflecting device is just shot into the center of the camera in the use position.

2. The vision screener of claim 1, wherein: The inside of the sleeve is provided with a platform, the platform has a horizontal surface and a vertical surface, the camera is placed on the platform, and the adjusting mechanism is arranged between the camera and the horizontal surface, and the camera and the vertical surface are fixedly connected through a fastener.

3. The vision screener of claim 2, wherein: The adjusting mechanism is a height-adjustable knob.

4. The vision screener of claim 3, wherein: The knob includes a supporting head and a connecting column, the supporting head abuts against the camera, and the connecting column is threadedly connected with the platform.

5. The vision screener of claim 4, wherein: The sleeve has a rear cover, the rear cover is detachably connected with the sleeve, and the camera is arranged between the rear cover and the sleeve.

6. The vision screener of claim 5, wherein: The knob is completely arranged in the inside of the sleeve.

7. The vision screener of claim 5, wherein: The end of the knob away from the camera extends to the outside of the sleeve.

8. The vision screener of any one of claims 1 to 7, wherein: The reflecting device includes a reflecting mirror and a support installed in the sleeve, and the reflecting mirror is installed on the support.

9. The vision screener of claim 8, wherein: The light emitting area of the light source is located in the central area of the light source.

10. The vision screener of claim 9, wherein: The camera adopts infrared shooting technology, and the reflecting mirror is a half-reflecting and half-transmitting mirror.

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