Lens Drive Apparatus Resonance Suppression via Damper Compound
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Solution Overview
Problem
Existing lens holder driving devices suffer from instability due to undesired resonance, which affects the quality of images captured by miniature cameras in mobile terminals, as they fail to effectively stabilize blurry images caused by movement.
Innovation Solution
A lens holder driving device with a lens holder moving portion that moves in directions orthogonal to the optical axis, supported by suspension wires and an elastic member, and equipped with damper compounds to suppress resonance, ensuring stable operation and image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If suspension wires are used to support the lens holder moving portion, then the device achieves miniaturization and reduced height, but undesired resonance occurs causing image instability
Solution Approach 1:
The patent introduces a damper compound as an intermediary element between the suspension wires and the lens holder moving portion. This damper compound absorbs and dissipates vibrational energy, preventing resonance from propagating through the suspension wires to the image sensor, thereby maintaining image stability while preserving the miniaturized device structure.
Solution Approach 2:
The patent converts the harmful resonance effect into a beneficial damping effect by incorporating vibration-absorbing materials in the suspension structure. The resonance vibrations are transformed into heat energy through internal friction in the damper compound, turning the problematic vibrational energy into a harmless thermal form that stabilizes the imaging system.
2Volume of moving object
If the lens holder moving portion is made lightweight for miniaturization, then device height is reduced, but impact resistance deteriorates
Solution Approach 1:
The patent employs composite materials in the suspension structure, combining lightweight materials for the lens holder moving portion with vibration-damping and shock-absorbing materials in the damper compound and suspension wire attachments. This composite approach maintains minimal device height while providing sufficient impact resistance through the synergistic properties of different materials.
Solution Approach 2:
The patent incorporates cushioning elements in advance within the suspension structure to protect against impact. The damper compound and elastic components are pre-positioned to absorb shock energy before it reaches the image sensor, ensuring impact resistance is built into the lightweight structure from the beginning rather than added as an afterthought.
3Reliability
If damping elements are added to suppress resonance, then image stability improves, but device complexity increases
Solution Approach 1:
The patent designs the damper compound to serve multiple functions simultaneously: it dampens resonance vibrations, absorbs impact shocks, and provides structural support for the lens holder moving portion. By making the damping element multi-functional, the patent improves image stability without proportionally increasing device complexity, as the same component performs several critical roles.
Solution Approach 2:
The patent merges the damping function with the existing suspension wire structure by coating or attaching damper compounds directly to the suspension wires. This integration combines the support function of the suspension wires with the vibration-damping function of the damper compound into a single unified structure, avoiding the need for separate damping components and thus minimizing increases in 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
The device achieves stable image capture by effectively suppressing resonance and enhancing impact resistance, allowing for clear images without blurriness even during movement.
Implementation Method 1
a plurality of suspension wires having first end portions fixed to the fixed member at outer regions thereof, extending along the optical axis, having second end portions fixed to the elastic member, and swingably supporting the lens holder moving portion
Implementation Method 2
at least one damper compound disposed so as to enclose at least one suspension wire among the plurality of suspension wires to suppress undesired resonance in the lens holder moving portion
Implementation Method 3
an elastic member mounted to the lens holder moving portion
Data Source
AI summary
A lens drive apparatus includes a plurality of protrusions that protrude from an end of a magnet holder in a direction of an optical axis toward an inner wall surface of a cover and function as a fracture prevention supporting member. The plurality of protrusions are configured to support prevention of fracture in a plurality of suspension wires by contacting the inner wall surface of the cover when a magnet holder moves in the direction of the optical axis.