Lens Driving Device Impact Limit Position Optimization
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Solution Overview
Problem
Existing lens driving devices face the risk of generating particles due to impact between the support member and the side walls of the support frames during deflection, which limits the deflection angle and requires additional measures to prevent damage.
Innovation Solution
The lens driving device incorporates first and second soft protruding rubbers strategically positioned on the support frames to reduce the impact speed by aligning impact limit positions closer to the deflection axis, thereby minimizing particle generation during lens adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support member cooperates with the side walls of the first support frame and the second support frame to limit the impact therebetween, then the deflection angle is prevented from being too large, but particles may be generated due to impact
Solution Approach 1:
A damping member is introduced as an intermediary element between the support member and the side walls of the support frames. This damping member absorbs impact energy during deflection, preventing direct contact and particle generation while still limiting the deflection angle to maintain reliability
Solution Approach 2:
The damping member is pre-installed in positions that anticipate potential impact between the support member and support frame side walls. By providing cushioning before impact occurs, the system prevents particle generation while maintaining the necessary deflection angle control
2Reliability
If the support member is deflected to drive the lens, then optical image stabilization is achieved, but impact with support frame side walls occurs
Solution Approach 1:
The damping member serves as a mediator between the moving support member and the stationary support frame side walls. It allows the support member to deflect for optical image stabilization while absorbing impact energy, thereby preventing damage without compromising the stabilization function
3Manufacturing precision
If the deflection angle is limited to prevent excessive movement, then positioning accuracy is maintained, but particle generation occurs due to impact
Solution Approach 1:
The damping member is positioned to allow the support member to deflect within the required angular range for positioning accuracy, while providing cushioning before impact with the support frame side walls occurs, thus preventing particle generation without compromising positioning precision
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 solution effectively reduces the risk of particle generation by optimizing the impact limit positions, ensuring smoother lens deflection and reducing potential damage, thus enhancing the device's operational reliability.
Implementation Method 1
a current is applied to the anti-shake coils so that the anti-shake coils cooperate with the corresponding anti-shake magnets to drive the first support frame to deflect
Implementation Method 2
at least two metal sheets, each of the at least two metal sheets being opposite to and spaced apart from one of the at least two anti-shake magnets, and one of the at least two metal sheets and one of the at least two anti-shake magnets magnetically attracting each other
Data Source
AI summary
A lens driving device includes first and second support frames, lens barrel, anti-shake magnets, anti-shake coils, flexible PCB, metal sheets, and support assembly including support member and first and second guiding posts. Support member includes support plate and first and second support walls. First soft protruding rubbers are respectively provided at positions of top surface of first support frame corresponding first support walls, and second soft protruding rubbers are respectively provided at positions of inner wall of second support frame corresponding to two sides of each second support wall. Compared with the prior art, lens driving device of the present disclosure makes impact limit position of first support walls closer to deflection axis position in first direction, and makes impact limit positions of second support walls closer to deflection axis position in second direction to reduce speed of limit impact, thereby reducing risk of generating particles due to impact.