Lens Device Guiding Unit for Flexible PCB Bending Control
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Solution Overview
Problem
The movable lens groups and their corresponding flexible printed circuit boards in existing lens devices are prone to breakage due to uncontrolled bending and forces during movement, and the lenses are susceptible to deformation under high temperature and humidity conditions due to interference fitting with the lens frame.
Innovation Solution
The lens device incorporates a guiding unit with a guiding-and-positioning element that stabilizes the flexible printed circuit boards, reducing bending stress, and uses adhesive-applying grooves to securely fix lenses within the lens frame, minimizing interference and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible printed circuit board is bent to accommodate the movable lens group, then the lens group can move along the optical axis, but the flexible printed circuit board is susceptible to breakage after long-term use
Solution Approach 1:
A guiding unit is introduced as an intermediary component between the movable lens group and the flexible printed circuit board. The guiding unit includes a guiding groove that guides the bent portion of the flexible printed circuit board, controlling its movement path and preventing uncontrolled bending. This mediator protects the flexible printed circuit board from excessive bending stress while allowing the lens group to move freely for zooming operation.
2Stability of the object's composition
If the curved portions of the lens outer circumferential surface fit the lens frame with interference, then the lens is fixed securely, but the lens sustains bias force and is susceptible to deformation under high temperature and humidity
Solution Approach 1:
The interference fitting relationship is removed between the lens and lens frame. Instead of relying on interference fit, the patent uses a guiding unit with a guiding groove to constrain the flexible printed circuit board, thereby eliminating the bias force applied to the lens by the lens frame. This extraction of the interference fitting mechanism prevents lens deformation under high temperature and humidity conditions while maintaining fixing stability through the guiding structure.
3Adaptability or versatility
If the flexible printed circuit board is allowed to move freely with the lens group, then the electrical connection is maintained, but the bending location is not under control and forces affect the lens group movement
Solution Approach 1:
The guiding unit acts as an intermediary that controls the movement of the flexible printed circuit board. The guiding groove in the guiding unit restricts the flexible printed circuit board to move along a predetermined path, ensuring that the bending location remains controlled. This allows the flexible printed circuit board to maintain electrical connection flexibility while preventing uncontrolled bending that would affect lens group movement precision.
Data Source
AI summary
A lens device includes a base, a guiding unit, a plurality of lens groups and a flexible printed circuit board. The guiding unit is disposed on the base in a first direction. The plurality of lens groups are disposed on the base and include at least one movable lens group that is movable along the guiding unit. The flexible printed circuit board is fixed to the movable printed circuit board, and bent in the first direction to form a bent portion. The guiding unit is disposed in contact with a top of the bent portion of the flexible printed circuit board.