Lens Driving Device Magnetic Shielding Position Sensor
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Solution Overview
Problem
The existing lens driving devices in cameras suffer from reduced anti-shake performance due to the alternating magnetic field generated by the anti-shake coil interfering with the position sensor's accuracy.
Innovation Solution
The lens driving device incorporates a magnetic block member to shield the magnetic field and separate the position sensor from the anti-shake coil, ensuring minimal magnetic interference and maintaining accurate position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the position sensor is located in the central hole of the anti-shake coil for compact design, then the device structure is simplified, but the detecting accuracy of the position sensor deteriorates due to magnetic field interference
Solution Approach 1:
The patent divides the coil structure into two separate parts: a driving coil and an anti-shake coil. This segmentation allows the position sensor to be positioned away from the anti-shake coil's magnetic field while maintaining functional integration, thus resolving the conflict between compact structure and detection accuracy.
Solution Approach 2:
The patent introduces a magnetic shield as an intermediary element between the anti-shake coil and the position sensor. This magnetic shield blocks the alternating magnetic field from the anti-shake coil, preventing interference with the position sensor's detection accuracy while allowing the compact integrated structure to be maintained.
2Reliability
If the anti-shake coil generates an alternating magnetic field for anti-shake operation, then the anti-shake function is achieved, but the position sensor's detecting accuracy is impacted
Solution Approach 1:
The patent segments the electromagnetic components into separate driving coil and anti-shake coil units with distinct functional zones. This spatial segmentation allows the anti-shake coil to generate its alternating magnetic field without directly interfering with the position sensor, maintaining both anti-shake performance and detection accuracy.
Solution Approach 2:
A magnetic shield is introduced as a mediator to block the alternating magnetic field from reaching the position sensor. This allows the anti-shake coil to operate effectively while protecting the position sensor from magnetic interference, thus maintaining both anti-shake performance and position detection accuracy.
3Volume of moving object
If the position sensor is placed close to the anti-shake coil for compact design, then the device size is reduced, but the anti-shake performance deteriorates due to magnetic interference
Solution Approach 1:
The patent segments the electromagnetic components into spatially separated driving and anti-shake coil units. This segmentation enables compact overall device volume while ensuring that the position sensor remains outside the interfering magnetic field zone of the anti-shake coil, maintaining anti-shake performance.
Solution Approach 2:
A magnetic shield is positioned between the anti-shake coil and the position sensor to block magnetic field interference. This allows the device to maintain a compact volume with all components in close proximity while the magnetic shield ensures that the position sensor is protected from the anti-shake coil's magnetic field, preserving anti-shake performance.
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 enhances the detecting accuracy of the position sensor and improves the overall anti-shake performance of the lens driving device by isolating the position sensor from the magnetic field, thereby stabilizing the lens module effectively.
Implementation Method 1
The lens driving device incorporates a magnetic block member to shield the magnetic field and separate the position sensor from the anti-shake coil
Implementation Method 2
the anti-shake coil generates an alternating magnetic field in operation
Data Source
AI summary
A lens driving device, includes a shell providing an accommodating space, a supporting frame accommodated in the accommodating space, a lens module received in the supporting frame and comprising at least one lens and a lens holder for holding the at least one lens, a circuit board accommodated in the accommodating space and having at least two adjacent surfaces, each of the at least two adjacent surfaces having a position sensor and an anti-shake coil arranged thereon and apart from each other, a magnet assembly having at least two first magnets and at least two second magnets fixed to the supporting frame, each of the at least two second magnets abutting against a corresponding first magnet and be adjacent to a corresponding position sensor. Comparing to the relevant technologies, the lens driving device has good performance and high reliability.