Dual-Camera Motor Magnetic Interference Isolation
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Solution Overview
Problem
In dual-camera mobile phones, the magnetic interference from motors with stabilization functions to Hall effect sensors in autofocus motors leads to a deterioration in photographing experience, such as increased focus time, due to strong magnetic fields generated by magnets and coils.
Innovation Solution
The solution involves positioning the Hall effect sensors and magnets in dual-camera devices such that the distance between them is greater than or equal to a preset threshold, using bipolar magnets and specific coil configurations to minimize magnetic interference, and employing non-magnetic or weak magnetic materials for the motor housings to further reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motor with stabilization function is disposed in a dual-camera mobile phone, then stabilization function is improved, but magnetic interference to Hall effect sensor worsens
Solution Approach 1:
The patent extracts the disturbing magnetic field source (second motor with stabilization function) from the immediate vicinity of the sensitive component (Hall effect sensor in first motor). By physically separating these two components through spatial arrangement, the harmful magnetic interference is eliminated while preserving both the stabilization function and autofocus function.
Solution Approach 2:
The patent transitions from a planar or compact arrangement to a three-dimensional spatial arrangement. The first motor and second motor are disposed in parallel with specific distance constraints in the vertical direction, utilizing the Z-axis dimension to achieve magnetic field isolation while maintaining a compact overall device structure.
2Object-affected harmful factors
If distance between Hall effect sensor and magnets is increased, then magnetic interference is reduced, but device volume increases
Solution Approach 1:
Instead of increasing horizontal distance between components, the patent utilizes the vertical dimension (Z-axis) to separate the Hall effect sensor and magnets. The first motor is arranged above the second motor with a controlled vertical distance, achieving magnetic field isolation without significantly increasing the device's footprint area.
Solution Approach 2:
The patent optimizes the distance parameter between the Hall effect sensor and the second motor magnets to a specific range (greater than or equal to a first preset distance). This parameter optimization achieves sufficient magnetic field isolation while minimizing the increase in device volume.
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
This configuration reduces magnetic interference between the motors, thereby improving the focus and stabilization functions, leading to enhanced user experience by minimizing focus time and stabilization performance.
Implementation Method 1
The motor measures and determines magnetic field intensity by disposing a Hall (Hall) effect sensor to determine a location of a lens
Implementation Method 2
the second coils are configured to levitate and support the second magnets during power-on
Implementation Method 3
a strong magnetic field is generated by magnets and coils in a power-on state, and further strong magnetic interference is generated to a Hall effect sensor
Data Source
AI summary
A dual-camera device includes a first camera and a second camera, where the first camera includes a first motor, and the first motor includes at least one first Hall effect sensor, where the second camera includes a second motor, the second motor and the first motor are disposed in parallel, the second motor includes N second coils and N second magnets, the second coils are configured to levitate and support the second magnets during power-on, N is a positive integer and is a multiple of four. A distance between a first disposition location of the first Hall effect sensor and a second disposition location of the second magnets in the second motor is greater than or equal to a first preset distance.