Hall Sensor Position Detection for Telescopic Camera
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Solution Overview
Problem
Existing position detection mechanisms for camera devices in mobile terminals face challenges in accurately determining the telescopic position and state, leading to potential damage and suboptimal shooting performance due to interference from external magnetic fields.
Innovation Solution
A position detection mechanism utilizing a Hall sensor with multiple working surfaces to sense magnetic fields from magnets, generating induction signals that determine the camera's position state, and includes a processor to control the camera's movement based on these signals, while also detecting external magnetic field interference to prevent errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single working surface Hall sensor is used to detect magnetic field, then the device complexity is reduced, but the detection accuracy deteriorates due to external magnetic field interference
Solution Approach 1:
The Hall sensor is divided into multiple independent working surfaces (first working surface and second working surface), each capable of sensing magnetic field independently. This segmentation allows the system to detect position information from multiple directions simultaneously, improving detection accuracy while maintaining reasonable device complexity through modular sensor design.
Solution Approach 2:
The patent introduces a new dimension of detection by adding multiple working surfaces that extend in different directions. Instead of a single-plane detection, the sensor now operates in multi-dimensional space, enabling it to distinguish between magnetic field changes caused by camera position movement and those caused by external magnetic fields, thus improving measurement precision.
2Reliability
If the Hall sensor works in a single direction only, then the device complexity is reduced, but the reliability deteriorates due to inability to distinguish position changes from external interference
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors signals from multiple working surfaces and compares them to determine camera position state. The system uses the differential information from multiple sensing directions to feedback-correct position detection, reliably distinguishing actual position changes from external magnetic field interference.
Solution Approach 2:
Each working surface of the Hall sensor is designed with specific local sensitivity characteristics oriented in different directions. This local quality differentiation allows the sensor to detect magnetic field changes specific to each direction, enabling the system to reliably identify camera position changes while filtering out external interference through directional analysis.
3Loss of information
If external magnetic field interference is not detected, then the device complexity is reduced, but the loss of information increases due to erroneous position detection
Solution Approach 1:
The patent performs preliminary detection of external magnetic field interference by monitoring signal characteristics from multiple working surfaces before final position determination. The control unit analyzes the differential signals in advance to identify potential interference conditions, allowing for preemptive correction or rejection of erroneous position data, thus preventing information loss.
Solution Approach 2:
The patent introduces an intermediary analysis layer through the control unit that processes signals from multiple working surfaces before generating final position information. This intermediary processing stage acts as a filter that distinguishes between valid position change signals and spurious interference signals, preventing information loss while maintaining manageable system complexity through software-based interference rejection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves detection accuracy and reliability by stabilizing signal generation and reducing interference, ensuring precise camera positioning and protecting the camera device from damage.
Implementation Method 1
a Hall sensor, which is arranged on the first body and includes a first working surface and a second working surface respectively extending in different directions, where the Hall sensor senses a magnetic field of the first magnet through the first working surface and generates a first induction signal
Implementation Method 2
the Hall sensor further senses the magnetic field of the first magnet through the second working surface and generates a second induction signal
Data Source
AI summary
An electronic device includes a camera and a position detection component arranged in an accommodating cavity. The position detection component includes a circuit board, a bracket, a first magnet, and a Hall sensor. The camera of the electronic device is arranged on the bracket, and the camera can stretch out of or retract into the accommodating cavity constituted by a housing. The Hall sensor includes a first working surface and a second working surface which respectively extend in different directions. The Hall sensor senses a magnetic field of the first magnet through the first working surface and the second working surface and generates induction signals. The induction signals are used to determine a stretching-out position and a retracting position of the camera.