Camera Module Magnetic Restoration for Lens Barrel Stability
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Solution Overview
Problem
Camera modules experience unwanted passive movements of the lens barrel due to external impacts, leading to noise and potential failure, which existing technologies fail to adequately address.
Innovation Solution
A camera module design incorporating a driving magnet and position restoration member, with specific length ratios and attractive forces, along with ball bearings to stabilize the lens barrel, reducing unwanted movements and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens barrel is made movable to enable autofocusing and OIS, then the functionality and adaptability of the camera module is improved, but the lens barrel becomes susceptible to unwanted passive movements and collisions due to external impacts
Solution Approach 1:
The position restoration member is pre-configured to face the driving magnet and apply a restorative force that counteracts external impacts before they can cause harmful collisions. The member is positioned and dimensioned (Yh < Mh) to ensure it engages with the driving magnet when displacement occurs, pushing it back toward the center position and preventing contact with housing walls.
Solution Approach 2:
The position restoration member acts as an intermediary element between the driving magnet and the housing walls. Instead of allowing direct contact between the moving lens barrel components and the stationary housing, the position restoration member mediates the interaction by providing a restorative force that limits displacement and prevents harmful collisions.
2Reliability
If the position restoration member is made longer to increase its restorative force, then the reliability is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent optimizes the length parameter of the position restoration member by establishing a specific relationship (Yh < Mh) between its length and the driving magnet length. This parameter optimization ensures the member is long enough to provide effective restorative force while remaining short enough to avoid excessive complexity and space occupation. The conditional expression defines the optimal parameter range that balances restoration capability with compact design.
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
The design effectively minimizes lens barrel shaking and noise caused by external impacts, enhancing the reliability and stability of the camera module.
Implementation Method 1
The position restoration member may apply a passive attractive force to the driving magnet to limit the displacement of the lens barrel in the optical axis direction
Implementation Method 2
a lens barrel driving unit including a driving magnet and a driving coil, configured to drive the lens barrel in an optical axis direction
Data Source
AI summary
A camera module includes a housing, a lens barrel configured to be movable in an optical axis direction, a barrel holder coupled to the lens barrel and disposed inside of the housing, a lens barrel driving unit configured to drive the lens barrel in the optical axis direction, including a driving magnet and a driving coil, and a position restoration member configured to face the driving magnet in a direction intersecting an optical axis, where a total length of the position restoration member in the optical axis direction is less than a total length of the driving magnet in the optical axis direction, to limit a displacement of the lens barrel in the optical axis direction.