Tripod Head Angle Sensing With Dual Magnetic Induction
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Solution Overview
Problem
Conventional tripod heads used in security cameras suffer from low precision and are prone to errors due to zero shift and complex physical structures, leading to inaccurate detection results.
Innovation Solution
A tripod head position identification method utilizing first and second magnetic induction devices to detect magnetic field strengths, calculating the relative angle and position of a magnetic element, enabling high-precision detection of 0° to 360° without the need for multiple zeroing or calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall switch is used as a position calibration point with a large stepper motor and synchronous pulley, then the tripod head can be directly driven, but zero shift occurs leading to errors in detection results and low precision
Solution Approach 1:
The patent replaces the mechanical Hall switch-based position calibration system with a magnetic field sensing system using two magnetic induction devices. This substitution eliminates the mechanical zero calibration requirement and provides continuous, accurate magnetic pole position detection without zero shift errors, thereby improving both measurement precision and reliability
Solution Approach 2:
The patent introduces a magnetic element as an intermediary between the tripod head and the detection system. The magnetic element carries magnetic poles that interact with the two magnetic induction devices, enabling indirect but precise position detection through magnetic field interactions rather than direct mechanical contact or calibration
2Ease of operation
If a mechanical locked-rotor method is adopted for zeroing, then the tripod head can be zeroed, but the fit of multi-stage reduction gears with structural members leads to poor precision
Solution Approach 1:
The patent replaces the mechanical locked-rotor zeroing method with a magnetic field-based position detection system. By using two magnetic induction devices to detect the positions of two magnetic poles simultaneously, the system achieves automatic zeroing and continuous position tracking without mechanical intervention, eliminating the precision losses from multi-stage reduction gears
Solution Approach 2:
The magnetic field sensing system performs self-calibration and continuous self-positioning by detecting the magnetic pole positions. The system automatically determines the tripod head position based on magnetic field strength variations, eliminating the need for manual zeroing operations and mechanical locked-rotor mechanisms
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 efficiency and accuracy of tripod head rotation angles by determining the current position and actual rotation angle based on magnetic field strengths, reducing interference and extending the service life of cables and components.
Implementation Method 1
obtaining a first magnetic field strength sensed by the first magnetic induction device and a second magnetic field strength sensed by the second magnetic induction device
Data Source
AI summary
Disclosed are methods, apparatus, systems, and computer-readable media for tripod head position identification. A tripod head may include magnetic induction device(s) and/or a magnetic element. The magnetic element may rotate relative to the magnetic induction device(s). A target magnetic pole of the magnetic element may have an initial position. Tripod head position identification may be performed by obtaining a first magnetic field strength sensed by magnetic induction device(s); determining a current position of the target magnetic pole based on magnetic field strength(s); and/or determining an actual rotation angle of the tripod head based on the initial position and the current position of the target magnetic pole. A rotation angle may be determined by a difference of relative magnetic field strengths of two magnetic induction devices.