Lens Driving Device Leaf Spring Wire Buckling Prevention
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Solution Overview
Problem
Conventional lens driving devices face issues with buckling and damage of wires due to external forces and tilting of the optical axis during camera shake correction, which complicates miniaturization and weight reduction while maintaining accurate lens movement.
Innovation Solution
The design incorporates a leaf spring with an elastic arm portion pulled outward by a supporting frame, and a wire attaching portion connected to the elastic arm, with the connecting position of the wire attaching portion disposed outside the securing position of the tip end portion of the supporting wire, to prevent buckling and maintain horizontal wire support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rigidity of the wires is increased to prevent buckling during dropping impact, then the reliability of wire support is improved, but the device size and weight cannot be reduced
Solution Approach 1:
The patent applies local quality by creating an asymmetric structure where the wire attaching portion extends beyond the wire securing position only in the direction opposite to the optical axis. This localized structural modification provides buckling prevention capability only where needed (at the wire attaching portion) without requiring increased rigidity throughout the entire wire or supporting frame, thus avoiding weight increase while maintaining reliability.
2Strength
If the wires are made more rigid to prevent damage from external forces, then the strength of the supporting structure is improved, but the driving portion size cannot be reduced
Solution Approach 1:
The patent implements local quality by providing enhanced structural strength only at the wire attaching portion through its extension beyond the wire securing position. This localized reinforcement prevents wire damage from external forces without requiring the entire supporting frame or wires to be made stronger, thus avoiding volume increase of the driving portion while maintaining supporting structure strength.
3Ease of manufacture
If the connecting position of the wire attaching portion is moved inward toward the optical axis, then the ease of manufacture is improved, but the optical axis tilting occurs during camera shake correction
Solution Approach 1:
The patent applies inversion by reversing the conventional design approach. Instead of positioning the wire attaching portion inward toward the optical axis for ease of manufacture, the patent extends it outward beyond the wire securing position in the direction opposite to the optical axis. This inverted positioning prevents optical axis tilting during camera shake correction while remaining manufacturable.
4Manufacturing precision
If the wire securing position is moved outward to prevent optical axis tilting, then the lens driving accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by combining the wire securing function and the optical axis stabilization function into a single integrated structure - the wire attaching portion. By extending this portion outward beyond the wire securing position, the patent simultaneously achieves wire support and optical axis alignment without requiring separate stabilization mechanisms, thus improving lens driving accuracy without increasing device complexity.
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 configuration effectively prevents wire buckling and damage from external impacts and ensures accurate lens movement by preventing optical axis tilting during camera shake correction, enabling high-accuracy and miniaturized lens driving.
Implementation Method 1
a leaf spring (11, 12, 13), and the back side of the lens frame (2) is supported on the back side of the supporting frame (10) through a back side leaf spring (13)
Implementation Method 2
the base supporting member (15) elastically supports, in directions that are perpendicular to the optical axis, the lens frame (2) that is supported on the supporting frame (10), through a plurality of supporting wires (14A, 14B, 14C, 14D)
Data Source
AI summary
Disclosed is a lens driving device includes: a lens frame; a support frame that elastically supports the lens frame in the optical-axis direction through plate springs; a base support member that elastically supports the lens frame supported by the support frame, in a direction intersecting the optical axis, through support wires; and a driving unit that drives the lens frame in one or both of the optical-axis direction and the direction intersecting the optical axis. The plate springs include elastic arm sections, respectively, which project outward of a portion at which the support frame is attached; and wire attaching sections which are connected to the elastic arm sections, respectively. A connecting position at which the wire attaching section and the elastic arm section are attached to each other is disposed outward of a fixing position where the leading end portion of a corresponding one of the support wires is fixed to the wire attaching section.