Structure for improving sensing range of Hall element and binocular night vision device
By placing magnets with opposite polarities on both sides of the Hall element, the magnetic field focusing effect is enhanced, solving the problem of the limited sensing range of the Hall element, achieving a larger interpupillary distance adjustment range and flexibility, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANTAI QICHUANG INTELLIGENT SOFTWARE TECHNOLOGY CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-05-01
AI Technical Summary
In the prior art, the interpupillary distance sensing range of Hall elements is limited, resulting in high interpupillary distance adjustment costs and making it difficult to expand the adjustment range without increasing the performance of Hall elements or magnets.
By placing a first magnet and a second magnet with opposite polarities on both sides of the Hall element, the magnetic field focusing effect is enhanced, thereby achieving a wider range of interpupillary distance adjustment.
Without replacing the Hall element or magnet, the interpupillary distance adjustment range is expanded by 10-15%, reducing costs and improving the flexibility and adaptability of interpupillary distance adjustment.
Smart Images
Figure CN224190323U_ABST
Abstract
Description
A structure for improving the sensing range of a Hall element and a binocular night vision device Technical Field
[0001] This solution relates to the field of head-mounted assistive vision interpupillary distance adjustment, specifically to a structure that improves the sensing range of Hall elements. Background Technology
[0002] Head-mounted assistive vision devices have become widely used in modern society, encompassing various product types such as head-mounted binocular low-light night vision devices and head-mounted VR glasses. These devices are designed and manufactured with individual differences in wearers, particularly interpupillary distance (IPD), in mind. Because IPD varies significantly from person to person, manufacturers typically incorporate adjustable IPD to ensure these devices are suitable for users with different IPDs. Specifically, the devices need a wide range of IPD adjustment capabilities to meet the needs of users with diverse IPDs, ensuring optimal visual experience and results for everyone. Through this user-friendly design, head-mounted assistive vision devices better serve a broad user base, enhancing comfort and practicality.
[0003] Currently, one method for automatically adjusting interpupillary distance (IPD) is to use a Hall effect sensor to detect the distance of IPD adjustment. The range of IPD is sensed by the cooperation of a magnet and a Hall effect sensor. When the instrument is detected to be adjusted beyond a certain angle, it automatically shuts down to save power. However, the range of IPD adjustment is limited by the sensitivity of the Hall effect sensor itself. In order to obtain a larger IPD adjustment range, the traditional solution is to use a stronger magnet or a more sensitive Hall effect sensor, but this will increase the cost. Summary of the Invention
[0004] The technical problem this invention aims to solve is how to improve the ability to adjust the interpupillary distance at a low cost.
[0005] The specific technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0006] A structure for improving the sensing range of a Hall element includes a Hall element and a first magnet and a second magnet disposed on both sides of the Hall element. The polarities of the opposite ends of the first magnet and the second magnet are opposite, and the distance between the first magnet, the second magnet and the Hall element is adjustable.
[0007] Furthermore, there are two Hall elements, and the distance between the two Hall elements is fixed.
[0008] A binocular night vision device, comprising the aforementioned structure for improving the sensing range of the Hall element.
[0009] Furthermore, the binocular night vision device includes a left eyepiece, a right eyepiece, and an intermediate body. The left and right eyepieces are respectively hinged to the intermediate body via a pivot. The left eyepiece is provided with a first magnet, and the right eyepiece is provided with a second magnet. The intermediate body is provided with a first Hall element and a second Hall element. The first Hall element is adapted to the first magnet, and the second Hall element is adapted to the second magnet. The opposite ends of the first magnet and the second magnet have opposite polarities.
[0010] Furthermore, the first magnet, the second magnet, the first Hall element, and the second Hall element are located on the same plane perpendicular to the hinge axis.
[0011] Furthermore, the interpupillary distance corresponding to the closest distance between the left and right eyepieces is the closest interpupillary distance L1, and the maximum distance between the left and right eyepieces that can keep the Hall element in a closed state is the maximum interpupillary distance for maintaining the open state L2. When the interpupillary distance exceeds L2, the binocular night vision device will be turned off.
[0012] When the interpupillary distance decreases to L3 (L3>L1), the Hall element changes from the off state to the closed state again, restarting the binocular night vision device. L3 is the maximum reopening interpupillary distance. Attached Figure Description
[0013] Figure 1 is a schematic diagram of a night vision device;
[0014] Figure 2 is a schematic diagram of the overall structure of a night vision device from a second perspective.
[0015] The following is a list of component names represented by the reference numerals in the attached diagram:
[0016] 1-1, Left eye; 1-2, Right eye; 1-3, First magnet; 1-4, Second magnet; 1-5, First Hall effect; 1-6, Second Hall effect. Detailed Implementation
[0017] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0018] The first magnet 1-3, the second magnet 1-4, the first Hall sensor 1-5, and the Hall sensors numbered 1-6 are all on the same plane. The entire device uses the magnitude of the magnetic field of the Hall sensors to control the switching on and off of the night vision device. The strength of the magnetic field sensed by the Hall sensors is related to the distance and angle of the magnets. The first Hall sensor 1-4 and the second Hall sensor 1-5 can be either Hall sensors for sensing magnetic field strength or Hall switches. If they are Hall sensors, they output an electrical signal, and the strength of the electrical signal represents the strength of the magnetic field. If they are Hall switches, they output a switching signal. Normally open Hall switches or normally closed Hall switches can be selected as needed. In this example, Hall switches are used.
[0019] As shown in Figure 1, taking the left eyepiece 1-1 as an example, assuming only the first magnet 1-3 and the first Hall element 1-4 exist, when the interpupillary distance L1 is at its minimum, the first magnet 1-3 is closest to the first Hall element 1-4, and the sensed magnetic field strength is the greatest. As the interpupillary distance gradually increases, the first magnet 1-3 gradually moves away from the first Hall element 1-5, and the magnetic field sensed by the first Hall element 1-5 gradually weakens. When the value sensed by the first Hall element 1-5 drops below the threshold A1, the overall control circuit controls the night vision device to shut down. The corresponding interpupillary distance at this time is the maximum maintainable interpupillary distance L2.
[0020] As the night vision device gradually decreases its interpupillary distance (IPD) from the maximum IPD L2, the first magnet 1-3 gradually approaches the first Hall sensor 1-5, and the magnetic field on the first Hall sensor 1-5 gradually increases. When the magnetic field increases to the threshold B1, the overall control circuit controls the power of the night vision device to be turned back on. The IPD at this time is called the maximum restart IPD L3.
[0021] Among them, L2 > L3 > L1.
[0022] Similarly, assuming only the second magnet 1-4 and the second Hall element 1-6 are present, the same applies to the right eyepiece. The maximum pupillary distance for maintaining the opening of the entire device is 2L2, the maximum pupillary distance for reopening the device is 2L3, and the minimum pupillary distance for the entire device is 2L1.
[0023] However, as shown in Figures 1 and 2, in this example, a first magnet 1-3 and a second magnet 1-4 are actually set on both sides of the first Hall 1-5 and the second Hall 1-6. Due to the interaction of the magnetic fields of the first magnet 1-3 and the second magnet 1-4, and the opposite magnetic properties of the sides of the first magnet 1-3 and the second magnet 1-4 facing each other (i.e., as shown in Figure 2, the first magnet 1-3 is the N pole and the second magnet 1-4 is the S pole), there is always a magnetic field between the first magnet 1-3 and the second magnet 1-4 that attracts each other. This causes the magnetic field strength between the first magnet 1-3 and the second magnet 1-4 to a certain extent to converge, which is equivalent to strengthening the magnetic field strength between the two to a certain extent. Actual testing showed that when the interpupillary distance between the left eyepiece 1-1 and the right eyepiece 1-2 reached 2L2, the magnetic field values sensed by the first Hall effect sensor 1-5 and the second Hall effect sensor 1-6 were still greater than A1, thus making the maximum open interpupillary distance of the entire device greater than 2L2. Similarly, the maximum reopening interpupillary distance of the entire device was greater than 2L3. Therefore, without replacing the Hall effect sensor with a more sensitive one or the magnet with a stronger one, a larger magnetic field sensing range and a larger interpupillary distance adjustment range were obtained.
[0024] Conversely, if the first magnet 1-3 and the second magnet 1-4 are set with the same polarity opposite each other, that is, N pole to N pole or S pole to S pole, then there will always be a magnetic field between the first magnet 1-3 and the second magnet 1-4 that repels each other. The maximum opening pupil distance of the whole machine will be less than 2L2, and the maximum re-opening pupil distance of the whole machine will be less than 2L3.
[0025] Based on the two structures mentioned above, five prototypes were made and assembled in two ways: with the same polarity and with opposite polarities. The measured data are as follows:
[0026] Table 1
[0027]
[0028] As can be seen from the test results in the table above, by setting the first magnet 1-3 and the second magnet 1-4 to opposite directions, compared with the traditional structure of setting them to the same direction, the maximum maintained pupillary distance is increased by about 10%, and the maximum reopened pupillary distance is increased by about 15%.
[0029] In summary, this scheme achieves a greater interpupillary distance by changing the orientation of the N and S poles of the magnets without altering the properties of the Hall effect and the magnets themselves.
[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A structure for improving the sensing range of a Hall element, characterized in that, It includes a Hall element and a first magnet and a second magnet disposed on both sides of the Hall element. The polarities of the first magnet and the second magnet are opposite at their opposite ends, and the distance between the first magnet, the second magnet and the Hall element is adjustable.
2. The structure for improving the sensing range of a Hall element according to claim 1, characterized in that, There are two Hall elements.
3. A binocular night vision device, characterized in that, Includes the structure for improving the sensing range of the Hall element as described in claim 1 or 2.
4. The binocular night vision device according to claim 3, characterized in that, It includes a left eyepiece, a right eyepiece, and an intermediate body. The left and right eyepieces are respectively hinged to the intermediate body via a pivot. The left eyepiece is provided with a first magnet, and the right eyepiece is provided with a second magnet. The intermediate body is provided with a first Hall element and a second Hall element. The first Hall element is adapted to the first magnet, and the second Hall element is adapted to the second magnet. The opposite ends of the first magnet and the second magnet have opposite polarities.
5. The binocular night vision device according to claim 4, characterized in that, The first magnet, the second magnet, the first Hall element, and the second Hall element are located on the same plane perpendicular to the hinge axis.
6. The binocular night vision device according to claim 4, characterized in that, The interpupillary distance corresponding to the closest distance between the left and right eyepieces is the closest interpupillary distance L1. The maximum distance between the left and right eyepieces that can keep the Hall element in a closed state is the maximum maintaining open interpupillary distance L2. When the interpupillary distance shrinks to L3 (L3>L1), the Hall element changes from a closed state back to a closed state, restarting the binocular night vision device. L3 is the maximum reopening interpupillary distance.