Serpentine Damping Springs for Faster Voice Coil Motor Stabilization
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Solution Overview
Problem
Existing voice coil motors experience prolonged vibration and instability when sudden current is applied, affecting image quality due to slow vibration attenuation, which is not conducive to focusing.
Innovation Solution
A damping spring with a serpentine shape is integrated into the voice coil motor, connecting the rotor to a fixed part, providing a buffering effect and correcting concentricity, replacing the lower spring with four damping springs arranged at the corners to enhance stability and vibration attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If regular springs are used in the voice coil motor, then the structure is simple, but the vibration attenuates slowly and the motor takes a long time to reach balance
Solution Approach 1:
The spring is constructed as a composite structure combining a linear spring portion made of elastic material and damping structures made of damping material. This composite construction allows the spring to simultaneously provide elastic restoring force and vibration damping, resolving the contradiction between structural simplicity and fast vibration attenuation.
Solution Approach 2:
The spring's damping characteristics are modified by changing the physical parameters of the damping structures (serpentine shape, number of bends, material properties). This allows the spring to achieve optimal vibration attenuation speed while maintaining structural simplicity, directly addressing the time loss issue without complex mechanisms.
2Ease of manufacture
If regular springs are used in the voice coil motor, then the manufacturing process is simple, but the concentricity of mover movement cannot be corrected
Solution Approach 1:
The damping structures are strategically positioned at specific locations along the spring, creating local zones with enhanced damping properties. This local quality enhancement allows the spring to correct concentricity deviations at critical points while maintaining overall manufacturing simplicity through standardized production methods.
3Device complexity
If the voice coil motor uses simple spring structure, then the device complexity is low, but the vibration buffering effect is insufficient
Solution Approach 1:
The damping structures are designed with serpentine (curved) geometry rather than straight linear forms. This curvature increases the path length and surface area of the damping material in contact with the moving components, enhancing the vibration buffering effect while keeping the overall spring structure relatively simple and compact.
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 damping springs effectively reduce and quickly stabilize vibrations, improving movement stability and focus speed by attenuating lens vibrations more rapidly, ensuring quick and clear image capture.
Implementation Method 1
the spring portion is provided with a plurality of damping structures bent in a serpentine shape
Implementation Method 2
the damping spring achieves a buffering effect, and ensures that a mover can effectively and quickly reduce vibration and reach a stationary state quickly
Data Source
AI summary
Disclosed are a damping spring, a voice coil motor equipped with damping springs, and a camera device. The damping spring includes a movable end connected to a rotor in a voice coil motor and a fixed end connected to a fixed part in the voice coil motor. A linear spring portion is disposed between the movable end and the fixed end, and the spring portion is provided with a plurality of damping structures bent in a serpentine shape.