Lens Driving Device Flexible PCB Segmentation
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Solution Overview
Problem
Lens driving devices with flexible printed circuit boards welded into one piece are prone to disengagement during movement and occupy excessive space, leading to inoperability and storage challenges.
Innovation Solution
A lens driving device design featuring independently arranged first and second flexible printed circuit boards, with folding portions attached to the support frames and shell, and a driving assembly that includes coils and magnets for rotation and movement, allowing for buffered movement and reduced space occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two flexible printed circuit boards are welded into one piece, then the bonding position requirement is high, but the structure is prone to disengagement during movement
Solution Approach 1:
The patent divides the flexible printed circuit board system into two independent boards instead of welding them together. The first flexible printed circuit board is connected to the first support frame, and the second flexible printed circuit board is connected to the second support frame, eliminating the welding process and reducing bonding position requirements while improving reliability during movement.
2Volume of moving object
If the folded portion of the flexible printed circuit board is placed on the side of the product, then the folding portion occupies a large space, but additional storage space is required
Solution Approach 1:
The patent integrates the folded portion of the first flexible printed circuit board into the lateral space between the first and second support frames, utilizing the depth dimension of the device rather than extending it outward. This allows the folded portion to be accommodated within the existing structural envelope, reducing the overall volume occupation and improving product stacking capability.
3Adaptability or versatility
If the first flexible printed circuit board surrounds two adjacent sidewalls of the first support frame, then the folding portions can be compressed or stretched, but the board structure becomes more complex
Solution Approach 1:
The patent utilizes the inherent flexibility of the flexible printed circuit board material to allow the board to surround two adjacent sidewalls of the first support frame. The folding portions are designed to be compressed or stretched during movement, leveraging the flexible film properties to accommodate dynamic structural changes without requiring additional mechanical components.
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 prevents disengagement of flexible printed circuit boards during movement, reduces space requirements for folding portions, and facilitates product stacking, ensuring reliable operation and efficient use of space in multi-shot scenarios.
Implementation Method 1
the bent portions are compressed or stretched with a movement of the first support frame
Implementation Method 2
a first driving assembly and a second driving assembly, where the first driving assembly is configured to drive the first support frame to rotate relative to the second support frame about the first axis or the second axis
Implementation Method 3
the second driving assembly is configured to drive the lens module to move along the optical axis
Data Source
AI summary
A lens driving device includes a lens module, a first support frame, a second support frame sleeved on the first support frame, a support assembly for suspending the first support frame inside the second support frame, a first flexible printed circuit board (PCB) including folding portions, a second flexible PCB opposite to and independent from the first flexible PCB, and a driving assembly. Each folding portion includes a first fixing portion attached to the first support frame, a second fixing portion attached to the shell, and bent portions connecting the first fixing portion with the second fixing portion by bending. The two flexible PCBs are separately provided in the lens driving device to prevent the risk of disengagement when the two flexible PCBs move, and the folding portions prevent the first flexible PCB from being pulled by the movement of the lens module to be disconnected.