Eyepiece disc assembly and flipping bat

Abstract

The utility model discloses an eyepiece disc assembly which comprises an eyepiece disc support, an eyepiece disc and a motor, and the middle part of the eyepiece disc is rotatably connected with the eyepiece disc support; the motor is arranged on the eyepiece disc bracket; the magnet is arranged on the eyepiece disc and rotates along with the eyepiece disc; the Hall sensor is arranged on the eyepiece disc support, and when the eyepiece disc rotates to a preset position, the Hall sensor is aligned with the magnet; the main control board is in communication connection with the motor and the Hall sensor, and when the Hall sensor is aligned with the magnet, the main control board controls the motor to stop. According to the utility model, the Hall sensor is used for monitoring the single-point position of the eyepiece disc, so that step loss accumulation of the motor can be effectively avoided, the cost is low, and the occupied space is small; the single-side eyepiece disc only occupies one pin of the main control board; according to the overturning bat disclosed by the utility model, the lenses can be automatically switched; the motor rotates the eyepiece disc, and the lens switching speed is uniform; and the interpupillary distance can be manually adjusted according to user requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of eyepiece discs, in particular to an eyepiece disc assembly and a flip racket. Background Art

[0002] When the eyepiece disc needs to be rotated to replace the lens, the main control board receives the user's command and sends a signal to the left and right motor drive modules. The left and right motors receive the pulse signal from the motor drive module and start to rotate a certain number of steps, driving the eyepiece disc to rotate to the target position through the gears. The motor generates magnetism according to a certain rule through the internal fixed coil, alternately attracting the permanent magnets on the rotor to rotate the rotor. Due to the limited magnetic force, the moment of inertia of the load carried by the rotor cannot be too large. When the environmental resistance is too large at certain moments, the rotor may not be able to rotate effectively with a small probability, which will cause step loss. The main control board can only send control instructions according to the demand, and it is unknown whether the motor is executed or whether it is executed accurately. A few steps may be within the error, but with the repeated use of the equipment or device, the accumulation of motor steps cannot be avoided, causing the eyepiece disc to move farther and farther away from the target position when the motor stops. Therefore, if you want to accurately control the rotation of the eyepiece disc to achieve the purpose of replacing the lens, you need to monitor the position of the eyepiece disc as necessary.

[0003] A sensor is needed to obtain the position of the eyepiece disc. Currently, there are many sensors used in the monitoring of the eyepiece disc position, such as photoelectric sensors, capacitive sensors, magnetic induction encoders, etc., which require multi-point monitoring of the eyepiece disc and even real-time position detection. There is no denying the advantages of these sensors in terms of high position control accuracy, but they all require encoders, complex procedures, and high requirements for the main control board. Communication protocols, multi-point monitoring, and real-time monitoring require more main control board resources; and the modules are relatively complex, which will take up more space for small-volume devices such as head-mounted devices, increase costs, and cause more complex problems. Therefore, in order to simplify the structure, there is an urgent need for an eyepiece disc positioning control method that does not rely on encoders. Utility Model Content

[0004] The purpose of the present application is to provide an eyepiece disc assembly and a flip racket to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] An eyepiece disc assembly, comprising:

[0007] Eyepiece tray holder;

[0008] An eyepiece plate, the middle portion of which is rotatably connected to an eyepiece plate bracket;

[0009] A motor, the motor is arranged on the eyepiece disc bracket, and the motor is used to drive the eyepiece disc to rotate;

[0010] A magnet, wherein the magnet is disposed on the eyepiece disk and rotates together with the eyepiece disk;

[0011] A Hall sensor, wherein the Hall sensor is disposed on the eyepiece disc bracket, and when the eyepiece disc rotates to a predetermined position, the Hall sensor is aligned with the magnet;

[0012] A main control board is communicatively connected with the motor and the Hall sensor. When the Hall sensor is aligned with the magnet, the main control board controls the motor to stop.

[0013] Optionally, the magnet is arranged on the outer edge of the eyepiece disc.

[0014] Optionally, the Hall sensor adopts a Hall unipolar switch sensor, and the S pole of the magnet faces the Hall unipolar switch sensor.

[0015] Optionally, a gear is provided on the outer peripheral wall of the eyepiece disc, and the motor shaft of the motor is meshed with the gear of the eyepiece disc through the gear.

[0016] A flip racket, comprising:

[0017] An eyepiece disc assembly, wherein the eyepiece disc assembly adopts the aforementioned eyepiece disc assembly;

[0018] The pupil distance adjustment component comprises two movable ends which move symmetrically in opposite directions horizontally, and the eyepiece disc assemblies are respectively arranged on the movable ends.

[0019] Optionally, the pupil distance adjustment component further includes:

[0020] An interpupillary distance slide rail, wherein the two movable ends are arranged on the interpupillary distance slide rail, and the two movable ends move symmetrically in opposite directions relative to the interpupillary distance slide rail;

[0021] The pupil distance adjustment knob is provided with an external gear, the movable end is provided with a rack, and the racks of the two movable ends are respectively meshed with the gears on the upper side and the lower side of the pupil distance adjustment knob.

[0022] Optionally, a groove is provided on the pupil distance slide rail, symmetrical sliding holes are provided on both sides of the groove, and a mounting post for mounting an eyepiece disc bracket is provided on the rear side of the movable end, and the mounting post passes through the sliding hole.

[0023] Optionally, a transverse through slot is provided at the upper end of the eyepiece disc holder, and the eyepiece disc holder is hung on the outer side of the pupil distance slide rail through the through slot.

[0024] Optionally, the eyepiece discs on the left and right sides are symmetrically arranged, and the motors on the left and right sides rotate in opposite directions but at the same speed.

[0025] In summary, the technical effects and advantages of the utility model are as follows: the utility model uses a Hall sensor to monitor the single-point position of the eyepiece disk. Within the allowable error range, the eyepiece disk will be reset when the equipment is started or needs to be reset, that is, the eyepiece disk is rotated to the single-point position of the Hall sensor. When the eyepiece needs to be replaced, the motor rotates a certain number of steps to drive the eyepiece disk to rotate; it can effectively avoid the accumulation of motor step loss, and the Hall unipolar switch sensor has low cost and small space occupancy; the module is simple, the signal transmission method is simple, and the requirements for the main control board are low. The single-side eyepiece disk only occupies one pin of the main control board, saving the main control board resources; the flip camera of the utility model can automatically switch lenses according to training requirements; the eyepiece disk is rotated by a motor, and the lens switching speed is uniform; the pupil distance can be manually adjusted according to user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 The structure of the flip racket in one embodiment of the utility model is schematically shown. Figure 1 ;

[0028] Figure 2 The structure of the flip racket in one embodiment of the utility model is schematically shown. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of an explosion of a flip racket in one embodiment of the utility model;

[0030] Figure 4 This is a flow chart of eyepiece disc reset in one embodiment of the utility model;

[0031] Figure 5 This is the internal circuit schematic of the Hall unipolar switch sensor.

[0032] Among them, 1. eyepiece disc; 2. magnet; 3. Hall sensor; 4. eyepiece disc bracket; 5. pupil distance rack; 6. pupil distance slide rail; 7. motor; 8. pupil distance adjustment knob. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] 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.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] In order to solve the problem of motor step loss accumulation and simplify the sensor structure and program, it is necessary to provide a sensor that does not rely on an encoder and is simple and easy to use to solve the problem of motor step loss accumulation and position the eyepiece disk. This embodiment provides an eyepiece disk assembly, on which a magnet and a Hall sensor 3 are used for positioning. The setting position of the magnet is a single-point position positioning point, and the Hall sensor 3 is used to monitor the single-point position of the eyepiece disk 1. Figure 1-Figure 4As shown, the eyepiece disc assembly includes an eyepiece disc bracket 4, an eyepiece disc 1, a motor 7, a magnet, a Hall sensor 3 and a main control board. The eyepiece disc bracket 4 is used to support the eyepiece disc 1, the motor 7 and the Hall sensor 3; the eyepiece disc 1 is equipped with a training lens. The middle part of the eyepiece disc 1 is rotatably connected with the eyepiece disc bracket 4; the motor 7 is arranged on the eyepiece disc bracket 4, and the motor 7 is used to drive the eyepiece disc 1 to rotate; the magnet is arranged on the eyepiece disc 1, and the magnet rotates with the eyepiece disc 1; the Hall sensor 3 is arranged on the eyepiece disc bracket 4, and when the eyepiece disc 1 rotates to a predetermined position, the Hall sensor 3 is aligned with the magnet; the main control board is in communication connection with the motor 7 and the Hall sensor 3, and when the Hall sensor 3 is aligned with the magnet, the main control board controls the motor 7 to stop.

[0038] Optionally, the magnet is arranged at the outer edge of the eyepiece disc 1, so as to facilitate the corresponding installation of the magnet and the Hall sensor 3. In this embodiment, the magnet is a magnet 2.

[0039] Optionally, the Hall sensor 3 adopts a Hall unipolar switch sensor, and the S pole of the magnet faces the Hall unipolar switch sensor. In this embodiment, the Hall unipolar switch sensor is a commercially available product. The Hall unipolar switch sensor has three pins, namely a positive power supply terminal, a negative power supply terminal and an output terminal. The positive power supply terminal is connected to the positive pole of the power supply, which provides a working voltage for the internal circuit of the Hall unipolar switch sensor. The negative power supply terminal is connected to the negative pole of the power supply. The output terminal is connected to a pull-up input pin of the main control board. A Hall unipolar switch sensor only occupies one pin of the main control board, saving the resources of the main control board. The Hall unipolar switch sensor detects the magnetic field and converts it into a signal, and then outputs the signal to the main control board from the output terminal. Figure 5 As shown, the Hall unipolar switch sensor has a circuit composed of a Hall element, a differential amplifier, a Schmitt trigger and a transistor. When the Hall unipolar switch sensor is connected to the circuit and powered on, current flows through the Hall element. When the S pole of the external magnet 2 approaches the Hall unipolar switch sensor, the current flowing in the Hall element is offset under the influence of the magnetic field, and a voltage is generated on both sides of the Hall element. The current is an electron. The side where the electrons are gathered is connected to the negative input of the differential amplifier, and the other side is connected to the positive input of the differential amplifier. After amplification by the differential amplifier, a high level is output. When the S pole of the external magnet is close enough to the Hall unipolar switch sensor, the voltage generated by the Hall element becomes larger, and the high level output by the differential amplifier is higher than the high level threshold of the Schmitt trigger. The Schmitt trigger outputs a high level, making the base of the transistor at a high level, and its emitter connected to the low level of the power supply, so the transistor is turned on, and the collector and emitter voltages are similar and output a low level. When the external magnet is removed, the Schmitt trigger outputs a low level, the transistor is cut off, and the collector is pulled up to output a high level. The collector of the transistor is the output end of the Hall unipolar switch sensor.

[0040] Optionally, a gear is provided on the outer peripheral wall of the eyepiece disc 1, and the motor shaft of the motor 7 is meshed with the gear of the eyepiece disc 1 through the gear.

[0041] The eyepiece disc 1 and the motor 7 are mounted on the eyepiece disc bracket 4, the eyepiece disc 1 can rotate on the eyepiece disc bracket 4, the motor 7 is fixed on the back of the eyepiece disc bracket 4, and the gear of the motor 7 is meshed with the external gear of the eyepiece disc 1, so as to ensure that the eyepiece disc 1 can be driven to rotate when the motor 7 rotor rotates, so as to realize the replacement of the training lens. The motor 7 of the present embodiment is set as a better structural scheme. In addition, the motor 7 can also be installed on the axis of rotation of the eyepiece disc 1, but the action point of this mode is on the rotating axis, which requires a greater driving ability of the motor 7, and the motor 7 is more likely to lose steps. The Hall unipolar switch sensor is also fixed on the back of the eyepiece disc bracket 4, close to the edge of the eyepiece disc 1, and the Hall unipolar switch sensor is directly opposite to the eyepiece disc 1. The magnet 2 is fixed on the back of the eyepiece disk 1 near the edge, with its S pole facing the Hall unipolar switch sensor. When the eyepiece disk 1 rotates, the magnet 2 can move relative to the Hall unipolar switch sensor, and there is a position where the magnet 2 is directly opposite to the Hall unipolar switch sensor. If this solution is applied to the eyepiece disk reset, this position is the positioning point for the eyepiece disk reset; if this solution is used to locate other rotational positions of the eyepiece disk 1, it is necessary to change the corresponding installation position of the magnet as the positioning point. In this embodiment, the motor 7 is a stepping motor.

[0042] This embodiment provides a method for controlling the positioning of an eyepiece disk. Figure 4 As shown, the following steps are included:

[0043] The main control board performs eyepiece disk positioning; when the device is started or there is a reset requirement, the main control board performs a reset operation on the eyepiece disk 1.

[0044] The eyepiece disk reset instruction is transmitted to the motor drive module, and the motor drive module controls the stepper motor 7 to rotate in a certain direction and controls its speed. The rotation directions of the left and right stepper motors 7 are different and the speeds are the same to maintain left-right symmetry. The stepper motor 7 drives the eyepiece disk 1 to rotate through gears. When rotating to a certain position, the magnet 2 on the eyepiece disk 1 rotates with the eyepiece disk 1 to the top of the Hall unipolar switch sensor, that is, the eyepiece disk reset point. At this time, the magnetic field generated by the magnet 2 in the Hall unipolar switch sensor is very strong, so that the Schmitt trigger inside the Hall unipolar switch sensor outputs a high level, the internal triode is turned on, and the Hall unipolar switch sensor outputs a low level, so that the pull-up input pin on the main control board changes from a high level to a low level, triggering an interrupt. The main control board controls the motor drive module to stop the stepper motor 7, and then clears the interrupt flag to avoid triggering an interrupt when the subsequent eyepiece disk 1 rotates. The left and right eyepiece disks 1 each need to correspond to a pull-up input pin of the main control board to trigger an interrupt, and the motor drive module controls the stepper motor 7 to stop. When both eyepiece disks 1 are reset, the reset operation ends.

[0045] Furthermore, the magnetic diffusion of the magnet 2 and the stepper motor 7 is very weak, and they maintain a certain distance, so the mutual influence is small and no interference is caused. It is required that the interval between the magnet 2 and the Hall unipolar switch sensor when facing each other should be very small to effectively trigger the interruption.

[0046] Furthermore, under the premise that the device does not fail, the stepping motor 7 losing steps is a low-probability event, and a single device startup does not generate too many eyepiece replacement requirements, and there is a certain error tolerance range, so the above program is of high quality. Preferably, an active eyepiece disk reset command can be added, and the above eyepiece disk reset program can be executed when the device is started or there is a need to reset the eyepiece disk.

[0047] The flip racket, which can also be called a flip racket, a flip mirror, a double-sided mirror, a butterfly racket, etc., is one of the most commonly used tools for checking and training visual accommodation function. It basically consists of a pair of myopia lenses and a pair of hyperopia lenses, wherein the myopia lenses can contract the ciliary muscles, and the hyperopia lenses can relax the ciliary muscles. The two pairs of lenses can be flipped back and forth for use, and the adjustment sensitivity can be checked, and can also be used for tight and loose adjustment training. The most important function of the flip racket is to train the adjustment sensitivity and improve the adjustment lag. Secondly, the flip racket can be used for training to increase the adjustment amplitude and improve the adjustment function. However, the current flip rackets still have certain limitations: most of them only have two pairs of lenses, and the lenses need to be replaced manually frequently to meet the training needs of different users; most of them are manual flip lenses, which put a heavy burden on the hands, and because they are manually controlled, some usage errors will inevitably occur. For this reason, this embodiment also provides a flip racket, including an eyepiece disc assembly and a pupil distance adjustment assembly. As Figure 1-4 As shown, the eyepiece disc assembly adopts the aforementioned eyepiece disc assembly. The pupil distance adjustment assembly includes two horizontally oppositely symmetrically movable ends, on which the eyepiece disc assembly is respectively provided, and the pupil distance adjustment assembly can adjust the left and right positions of the eyepiece disc 1.

[0048] Optionally, the interpupillary distance adjustment component further includes an interpupillary distance slide rail 6 and an interpupillary distance adjustment knob 8, the two movable ends are arranged on the interpupillary distance slide rail 6, and the two movable ends move symmetrically in opposite directions relative to the interpupillary distance slide rail 6; the interpupillary distance adjustment knob 8 is provided with an external gear, and the movable end is provided with a rack, and the racks of the two movable ends are respectively meshed with the gears on the upper and lower sides of the interpupillary distance adjustment knob 8. When the interpupillary distance adjustment knob is turned, the two movable ends move in opposite directions, that is, move outward or inward at the same time, thereby driving the eyepiece disc 1 to move inward or outward.

[0049] In this embodiment, the movable end is the interpupillary distance rack 5, which is two L-shaped structures coupled to each other and can fix the eyepiece mounting seat. The interpupillary distance rack 5 is arranged in the interpupillary distance slide rail 6; the interpupillary distance adjustment knob 8 is a disc-shaped structure with a protruding gear structure in the middle, and the interpupillary distance is controlled by adjusting the interpupillary distance rack 5.

[0050] Optionally, a groove is provided on the pupil distance slide rail 6, symmetrical sliding holes are provided on both sides of the groove, and a mounting column for mounting the eyepiece disc bracket 4 is provided on the rear side of the movable end, and the mounting column passes through the sliding hole.

[0051] Optionally, a transverse through slot is provided at the upper end of the eyepiece disc holder 4. The interpupillary distance slide rail 6 is used to provide a placement space for the interpupillary distance rack 5, the eyepiece disc holder 4 is hung on the outer side of the interpupillary distance slide rail 6 through the through slot, and the interpupillary distance adjustment knob 8 is installed on the interpupillary distance slide rail 6.

[0052] Specifically, the eyepiece disc 1 is a disc-shaped structure, equipped with training lenses; the edge is a toothed structure, meshing with the shaft gear of the motor 7; the magnet 2 is assembled on the edge of the eyepiece disc 1, and the magnet 2 and the Hall sensor 3 sense and determine the position of the eyepiece disc 1.

[0053] The motor 7 controls the rotation of the eyepiece disk 1. The motor 7 is controlled by the main control board and the Hall sensor 3. In this embodiment, the motor 7 is a stepper motor 7. The Hall sensor 3 and the magnet positioning in this embodiment are used to reset the eyepiece disk 1. During training, the motor 7 rotates under the control of the preset program of the main control board. During reset, the Hall sensor 3 senses the magnetic field of the magnet and outputs a low level, so that the pull-up input pin of the main control board changes from a high level to a low level, triggering an interrupt, and the motor 7 stops.

[0054] The magnet 2 is a cylindrical structure, fixed on the eyepiece disc 1, and serves as the sensing part of the Hall sensor 3. When resetting, it serves as a mark to determine the position of the eyepiece disc 1. The Hall sensor 3 is used to sense the electromagnet 2 to control the rotation of the motor 7 and thus control the position of the eyepiece disc 1. This embodiment is used to control the resetting of the eyepiece disc. In other embodiments, the positioning of other rotational positions of the eyepiece disc 1 can be controlled by changing the installation position of the magnet.

[0055] The eyepiece disc bracket 4 is an arched structure, providing a space for installing the eyepiece disc 1; the eyepiece disc bracket 4 itself is fixed on the pupil distance rack 5, and coupled to the pupil distance slide rail 6 through a hanging belt structure. The lower end of the eyepiece disc bracket 4 provides a fixing space for the motor 7. The eyepiece discs 1 on the left and right sides are symmetrically arranged, and the rotation directions of the motors 7 on the left and right sides are opposite and the speed is the same.

[0056] Adjusting the pupil distance: rotating the pupil distance adjustment knob 8, the gear drives the two pupil distance racks 5 to move in different directions in the horizontal position, the pupil distance racks 5 are connected to the eyepiece disc bracket 4, and the eyepiece disc 1 is rotatably provided on the eyepiece disc bracket 4, thereby driving the eyepiece disc 1 to move horizontally to adjust the pupil distance.

[0057] Training: Start training, the host sends instructions to the motor 7 of the eyepiece disc 1 through the serial port. The motor 7 is a stepper motor. The motor 7 determines the rotation angle of the eyepiece disc 1 by counting the number of rotation steps, thereby controlling the eyepiece disc 1 to rotate to a specified position, so that the user can observe the target through the positive lens; after a period of time, the host sends instructions to the motor 7 through the serial port, and the motor 7 rotates to a specified position, so that the user can observe the target through the specified negative lens. Repeat the above steps until the training is completed. The positive lens and the negative lens are training lenses assembled on the eyepiece disc 1, which are prior art and will not be repeated here.

[0058] Reset: After the user completes the training, the host sends a reset command to the motor 7 through the serial port. The motor 7 drives the eyepiece disk 1 to rotate. When the eyepiece disk 1 rotates and drives the magnet 2 to be closest to the Hall unipolar switch sensor, this is the reset point of the eyepiece disk 1. The Hall unipolar switch sensor outputs a low level, which is connected to the pull-up input pin of the main control board, so that this pin changes from a high level to a low level, triggering an interrupt, stopping the motor, and stopping the eyepiece disk 1 to complete the reset. After the reset is completed, the Hall unipolar switch sensor does not need to be monitored in real time, and the interrupt flag is cleared, so that the occupied main control board resources can be released in time. Each reset is reset through a specific position, rather than simply reset through the program, so the lost steps of the stepper motor 7 will be cleared.

[0059] The present embodiment uses a Hall unipolar switch sensor to monitor the single-point position of the eyepiece disk. Within the allowable error range, when the device is started or needs to be reset, the eyepiece disk will be reset, that is, the eyepiece disk will be rotated to the above-mentioned single-point position. When the eyepiece needs to be replaced, the motor rotates a certain number of steps to drive the eyepiece disk to rotate, which can effectively avoid the accumulation of motor step loss. The Hall unipolar switch sensor has low cost and small space occupation; the module is simple, the signal transmission method is simple, and the requirements for the main control board are low. The single-side eyepiece disk only occupies one pin of the main control board, saving the main control board resources; the flip camera of the present embodiment can automatically switch the lens according to the training requirements; the eyepiece disk is rotated by a motor, and the lens switching speed is uniform; the pupil distance can be manually adjusted according to user needs.

[0060] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended 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 can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An eyepiece disc assembly, characterized in that: include: Eyepiece tray holder; An eyepiece plate, the middle portion of which is rotatably connected to an eyepiece plate bracket; A motor, the motor is arranged on the eyepiece disc bracket, and the motor is used to drive the eyepiece disc to rotate; A magnet, wherein the magnet is disposed on the eyepiece disk and rotates together with the eyepiece disk; A Hall sensor, wherein the Hall sensor is disposed on the eyepiece disc bracket, and when the eyepiece disc rotates to a predetermined position, the Hall sensor is aligned with the magnet; A main control board is communicatively connected with the motor and the Hall sensor. When the Hall sensor is aligned with the magnet, the main control board controls the motor to stop.

2. The eyepiece disc assembly according to claim 1, characterized in that: The magnet is arranged on the outer edge of the eyepiece disc.

3. The eyepiece disc assembly according to claim 1, characterized in that: The Hall sensor adopts a Hall unipolar switch sensor, and the S pole of the magnet faces the Hall unipolar switch sensor.

4. The eyepiece disc assembly according to claim 1, characterized in that: The outer peripheral wall of the eyepiece disc is provided with a gear, and the motor shaft of the motor is meshed with the gear of the eyepiece disc through the gear.

5. A flip racket, characterized in that: include: An eyepiece disc assembly, wherein the eyepiece disc assembly is an eyepiece disc assembly as claimed in any one of claims 1 to 4; The pupil distance adjustment component comprises two movable ends which move symmetrically in opposite directions horizontally, and the eyepiece disc assemblies are respectively arranged on the movable ends.

6. The flip racket according to claim 5, characterized in that: The pupil distance adjustment component also includes: An interpupillary distance slide rail, wherein the two movable ends are arranged on the interpupillary distance slide rail, and the two movable ends move symmetrically in opposite directions relative to the interpupillary distance slide rail; The pupil distance adjustment knob is provided with an external gear, the movable end is provided with a rack, and the racks of the two movable ends are respectively meshed with the gears on the upper side and the lower side of the pupil distance adjustment knob.

7. The flip racket according to claim 6, characterized in that: The interpupillary distance slide rail is provided with a groove, and symmetrical sliding holes are provided on both sides of the groove. A mounting column for mounting an eyepiece disc bracket is provided on the rear side of the moving end, and the mounting column passes through the sliding hole.

8. The flip racket according to claim 7, characterized in that: The upper end of the eyepiece disc bracket is provided with a transverse through slot, and the eyepiece disc bracket is hung on the outer side of the pupil distance slide rail through the through slot.

9. The flip racket according to claim 5, characterized in that: The eyepiece discs on the left and right sides are symmetrically arranged, and the rotation directions of the motors on the left and right sides are opposite but the speeds are the same.

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