Camera Lens Module Integrated Magnet Actuator
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Solution Overview
Problem
Conventional camera lens modules in mobile devices face limitations in size and accuracy due to the use of separate sets of magnets and coil windings for autofocusing and image stabilization, leading to inefficient open-loop control systems that cannot accurately measure current and movement, resulting in suboptimal performance.
Innovation Solution
A camera lens module design that integrates four magnets at the corners of the image stabilization carrier, with first and second flexible circuit boards featuring coil windings and Hall sensors, allowing for closed-loop control and eliminating the need for separate magnet sets, thus enhancing precision and reducing bulkiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sets of magnets and coil windings are used for autofocusing and image stabilization actuators, then each actuator can function independently, but the device size and complexity increase significantly
Solution Approach 1:
The patent combines separate magnet and coil winding sets for autofocusing and image stabilization into a single integrated assembly. The same magnets and coils serve dual purposes: generating electromagnetic forces for both autofocusing movement and image stabilization compensation, thereby reducing device size and complexity while maintaining independent actuator functionality through control strategy rather than physical separation
Solution Approach 2:
The integrated magnet-coil assembly performs multiple functions simultaneously. The electromagnetic interaction between the coils and magnets generates forces that can be controlled to achieve both autofocusing (along optical axis) and image stabilization (perpendicular to optical axis) movements, making the actuator system universal and adaptable to multiple functions without requiring separate dedicated components for each function
2Device complexity
If open-loop control system is adopted for autofocusing and image stabilization, then the system structure is simpler, but measurement precision and control accuracy deteriorate
Solution Approach 1:
The patent implements a closed-loop feedback control system that uses Hall sensors to detect the positions of magnets in real-time. The Hall sensors measure the magnetic field strength, which corresponds to the position of the magnets, and this position information is fed back to the control unit. The control unit then adjusts the current supplied to the coils based on the feedback signal, enabling precise measurement and control of both autofocusing and image stabilization movements, overcoming the limitations of open-loop control
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 design enables precise autofocusing and image stabilization with reduced size, utilizing closed-loop control to accurately measure and adjust electromagnetic forces, improving the accuracy and adaptability of camera lens modules.
Implementation Method 1
first and second flexible circuit boards with coil windings and Hall sensors
Implementation Method 2
first and second flexible circuit boards with coil windings
Data Source
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AI summary
A camera lens module includes a lens unit, an automatic focus actuator including a first flexible circuit board. The first flexible circuit board has a plurality of first coil windings and a first Hall sensor. The plurality of first coil windings actuates the lens unit along an optical axis. An image stabilization actuator includes an image stabilization carrier having a plurality of magnets facing the first coil windings and a second flexible circuit board having a plurality of second coil windings facing respective lower surfaces of the magnets and a second Hall sensor. The camera lens module includes a base coupled with the image stabilization actuator under the image stabilization actuator, and a plurality of rollers disposed on the base and configured to rollably move the image stabilization actuator.