Lifting camera lifting position detection system based on double-shaft Hall sensor

Abstract

The utility model belongs to the technical field of camera control, and particularly relates to a lifting camera lifting position detection system based on a double-shaft Hall sensor, which comprises a camera module, a lifting module, a magnet assembly, a double-shaft Hall sensor and a signal processing unit, the camera module is fixedly connected to the sliding block and ascends and descends on the lifting assembly, the camera module is located on the sliding block connected with the camera module, and the double-shaft Hall sensor is located on the side edge of the lifting stroke center of the lifting module. The double-shaft Hall sensor is used for detecting X-axis and Y-axis magnetic flux signals generated by the lifting motion of the magnet assembly on the lifting assembly, the double-shaft Hall sensor is connected with the signal processing unit, and the signal processing unit receives the magnetic flux signals of the double-shaft Hall sensor. According to the utility model, the problem that a single-shaft Hall sensor used for detecting the position of the lifting camera in the prior art is easily interfered by an external magnetic field can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of camera control technology, and in particular relates to a lifting position detection system for a lifting camera based on a dual-axis Hall sensor. Background Technology

[0002] With the continuous development of camera technology, pop-up cameras are widely used in smartphones, surveillance equipment, drones, and other fields. Position detection of pop-up cameras is one of the key technologies for achieving precise control. Currently, the commonly used position detection solution mainly uses a single-axis Hall sensor. The Hall sensor is usually placed at the top and bottom of the pop-up module, and determines the camera's position by detecting changes in the magnetic field.

[0003] The single-axis Hall sensor has the following characteristics: When the single-axis Hall sensor is placed at one end of the travel, the closer the Hall sensor is to the magnet, the greater the detected magnetic flux; the farther away it is, the smaller the detected magnetic flux. The magnet changes position with the camera module, and the change in the camera module's position changes exponentially with the Hall detection data. As the camera module gets farther and farther away from the Hall sensor, the change in the Hall detection data becomes smaller and smaller, eventually approaching zero. At this point, the anti-interference ability becomes weaker and weaker, and it is easily affected by external magnetic fields, causing functional abnormalities.

[0004] Therefore, the traditional single-axis Hall sensor detection scheme has the following drawback: external magnetic fields can affect the detection accuracy of the Hall sensor, resulting in inaccurate position detection and affecting the accurate lifting and lowering of the camera and the stability of the device. Utility Model Content

[0005] The technical problem solved by this invention is to provide a lifting position detection system for a lifting camera based on a dual-axis Hall sensor, so as to solve the problem that the single-axis Hall sensor used in the existing lifting camera position detection is easily interfered with by external magnetic fields.

[0006] The basic solution provided by this utility model is a lifting camera position detection system based on a dual-axis Hall sensor, including a lifting camera module, a magnet assembly, a dual-axis Hall sensor, and a signal processing unit. The lifting camera module includes a camera module and a lifting module. The lifting module includes a slider and a lifting assembly. The slider is mounted on the lifting assembly. The camera module is fixedly connected to the slider and moves up and down on the lifting assembly. The camera module is located on the slider connected to the camera module. The dual-axis Hall sensor is located on the side of the center of the lifting stroke of the lifting module. The dual-axis Hall sensor is used to detect the magnetic flux signals on the X and Y axes generated by the lifting motion of the magnet assembly on the lifting assembly. The dual-axis Hall sensor is connected to the signal processing unit, which is used to receive the magnetic flux signals from the dual-axis Hall sensor.

[0007] Furthermore, the lifting assembly includes a motor assembly and a guide rail, the motor assembly includes a motor and a lifting drive rod, and the lifting drive rod is connected to the motor drive shaft;

[0008] The slider is mounted on the guide rail, the camera module and the magnet assembly are mounted on the slider, the guide rail is arranged parallel to the lifting drive rod, and the slider is also connected to the lifting drive rod and moves up and down on the lifting drive rod.

[0009] Furthermore, the magnet assembly uses a small neodymium iron boron magnet, which is fixed to the slider near the side where the biaxial Hall sensor is mounted.

[0010] Furthermore, the signal processing unit adopts one of the following: STM32 microcontroller, Xiaohua microcontroller, and PuRan microcontroller.

[0011] Furthermore, the dual-axis Hall sensor is the MLX90393 dual-axis Hall sensor.

[0012] The principle and advantages of this utility model are as follows: In this application, the camera module of the lifting camera module relies on the lifting module to achieve lifting. The motor in the lifting module rotates, driving the lifting drive rod, thereby allowing the slider, which is equipped with the camera module and the magnet assembly, to move up and down on the guide rail. A dual-axis Hall sensor, such as the MLX90393 dual-axis Hall sensor, located on the side of the center of the lifting module's lifting stroke, can measure the magnetic flux signal generated by the small neodymium iron boron magnet fixed on the slider. These magnetic flux signals are transmitted to a signal processing unit, which can be any one of an STM32 microcontroller, a Xiaohua microcontroller, or a Promicron microcontroller. The signal processing unit controls the lifting of the camera module.

[0013] Therefore, the advantages of this application are as follows: First, by measuring the magnetic flux signal using a dual-axis Hall sensor to detect position, compared to the traditional single-axis Hall sensor position detection method, it has higher accuracy and stability, and can more accurately determine the lifting position of the camera module, ensuring the precise use of the camera. Second, the small neodymium iron boron magnet is small in size and has strong magnetism, making it easy to install on the slider, and can generate a stable magnetic field for the Hall sensor to detect. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method:

[0016] The markings in the accompanying drawings include: camera module 1, motor 2, lifting drive rod 3, slider 4, guide rail 5, magnet assembly 6, and dual-axis Hall sensor 7.

[0017] The basic implementation examples are as follows: Figure 1 The system described is a lifting camera position detection system based on a dual-axis Hall sensor. It includes a lifting camera module, a magnet assembly 6, a dual-axis Hall sensor 7, and a signal processing unit. The lifting camera module comprises a camera module 1 and a lifting module. The camera module 1 is selected based on the actual application scenario and shooting requirements. The lifting module includes a slider and a lifting assembly. The lifting assembly includes a motor assembly and a guide rail. The motor assembly includes a motor 2 and a lifting drive rod 3. The motor 2 is a stepper motor, paired with a high-precision, high-strength lifting drive rod 3. The lifting drive rod 3 is a metal screw rod connected to the drive shaft of the motor 2, efficiently converting the rotational motion of the motor 2 into linear lifting motion. The slider 4 is mounted on the guide rail 5 and is also connected to the lifting drive rod 3. The motor 2 drives the lifting drive rod 3 to rotate, which in turn drives the slider 4 to move up and down. The guide rail 5 is made of smooth stainless steel to prevent directional deviation during movement.

[0018] The slider 4 has good load-bearing capacity and is equipped with a camera module 1 and a magnet assembly 6. Specifically, the camera module 1 is installed on the top of the slider 4, the magnet assembly 6 is installed on the upper side of the slider 4, and the dual-axis Hall sensor 7 is located on the side of the center of the lifting stroke of the lifting module. Therefore, the magnet assembly 6 installed on the slider 4 interacts with the dual-axis Hall sensor 7. The position of the magnet assembly 6 caused by its lifting action changes and is sensed by the dual-axis Hall sensor 7, which generates a magnetic flux signal. At the same time, the dual-axis Hall sensor 7 is connected to the signal processing unit and can transmit the sensed magnetic flux signal to the signal processing unit.

[0019] The magnet assembly 6 uses a small neodymium iron boron magnet. Due to its high magnetic energy product and high coercivity, it can generate a stable and strong magnetic field, which is convenient for the dual-axis Hall sensor 7 to detect. The magnet assembly 6 is installed on the side of the slider 4 close to the dual-axis Hall sensor 7. The direction of the magnetic field it generates is perpendicular to the X-axis detection direction of the dual-axis Hall sensor 7 and consistent with the Y-axis detection direction. It provides a detectable magnetic flux signal for the dual-axis Hall sensor 7 and plays a key role as the signal source carrier in the whole system, establishing a physical connection between the lifting camera module and the dual-axis Hall sensor 7.

[0020] The dual-axis Hall sensor 7 uses the MLX90393 model, which, with its advantages of high precision, high sensitivity, and low noise, can accurately measure the magnetic flux signal of the magnet assembly 6. Its operating voltage range and interface type must be compatible with other circuits in the system to ensure stable operation. The dual-axis Hall sensor 7 is installed securely on the side of the center of the lifting module's lifting stroke, with its detection surface facing the magnetic field direction of the magnet assembly 6. It converts the detected magnetic flux signal into an electrical signal and outputs it to the signal processing unit, serving as a crucial bridge connecting physical quantity detection and signal processing.

[0021] Based on the system's requirements for processing speed, storage capacity, and cost, the signal processing unit rationally selects from STM32 microcontrollers, Xiaohua microcontrollers, and PuRan microcontrollers. The STM32 series microcontrollers offer abundant resources and development documentation, making them suitable for projects with high functional expandability requirements; Xiaohua microcontrollers may offer better cost-effectiveness in specific application scenarios; and PuRan microcontrollers excel in low-power applications. The signal processing unit connects to the dual-axis Hall sensor 7 via a specific interface to receive and process magnetic flux signals. Simultaneously, it connects to the motor 2 assembly via control lines, controlling the forward and reverse rotation and speed of motor 2 based on the processing results, achieving precise control of the lifting camera module. Furthermore, the signal processing unit is connected to peripheral circuits such as a reset circuit and clock circuit to ensure its own normal operation, and it also reserves communication interfaces such as SPI and UART for data interaction with other devices.

[0022] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A lifting camera lifting position detection system based on a dual-axis Hall sensor, characterized in that: The device includes a lifting camera module, a magnet assembly, a dual-axis Hall sensor, and a signal processing unit. The lifting camera module comprises a camera module and a lifting module. The lifting module includes a slider and a lifting assembly. The slider is mounted on the lifting assembly. The camera module is fixedly connected to the slider and moves up and down on the lifting assembly. The camera module is located on the slider connected to the camera module. The dual-axis Hall sensor is located to the side of the center of the lifting stroke of the lifting module. The dual-axis Hall sensor is used to detect the X-axis and Y-axis magnetic flux signals generated by the lifting motion of the magnet assembly on the lifting assembly. The dual-axis Hall sensor is connected to the signal processing unit, which is used to receive the magnetic flux signals from the dual-axis Hall sensor.

2. The lifting position detection system for a lifting camera based on a dual-axis Hall sensor according to claim 1, characterized in that: The lifting assembly includes a motor assembly and a guide rail. The motor assembly includes a motor and a lifting drive rod, and the lifting drive rod is connected to the motor drive shaft. The slider is mounted on the guide rail, the camera module and the magnet assembly are mounted on the slider, the guide rail is arranged parallel to the lifting drive rod, and the slider is also connected to the lifting drive rod and moves up and down on the lifting drive rod.

3. The lifting position detection system for a lifting camera based on a dual-axis Hall sensor according to claim 2, characterized in that: The magnet assembly uses a small neodymium iron boron magnet, which is fixed to the slider near the side where the biaxial Hall sensor is mounted.

4. The lifting position detection system for a lifting camera based on a dual-axis Hall sensor according to claim 3, characterized in that: The signal processing unit uses one of the following: STM32 microcontroller, Xiaohua microcontroller, or PuRan microcontroller.

5. The lifting position detection system for a lifting camera based on a dual-axis Hall sensor according to claim 4, characterized in that: The dual-axis Hall sensor is the MLX90393 dual-axis Hall sensor.

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