Voice Coil Motor Elastic Member Layout for Stable Rotor Driving
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Solution Overview
Problem
Conventional camera modules with Voice Coil Motors (VCMs) face issues with the leaf spring causing twist or heaving, leading to bad driving of the rotor, which affects the adjustment of the gap between the lens and the image sensor, resulting in poor image quality.
Innovation Solution
The VCM design includes a rotor with a first driving unit, a stator with a second driving unit, a base with connection terminals, and elastic members that prevent the elastic member from bending, tilting, or heaving by using a separate connection member, ensuring stable electrical connections and preventing bad driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leaf spring is formed with a terminal unit bent for applying driving current to the coil block, then electrical connection is achieved, but twist or heving phenomenon is generated causing bad driving of the rotor
Solution Approach 1:
The leaf spring is divided into two separate components: a support elastic member that provides structural support and a separate elastic member that provides electrical connection. This segmentation eliminates the twist and heving phenomena caused by the integrated terminal unit while maintaining both structural stability and electrical connectivity functions.
Solution Approach 2:
A separate elastic member acts as an intermediary between the support elastic member and the coil block, providing electrical connection without compromising the structural integrity of the support elastic member. This intermediary component transfers electrical current while allowing the support structure to remain stable.
2Use of energy by moving object
If the terminal unit is bent to apply driving current, then electrical connection is established, but the rotor generates bad driving due to twist or heving
Solution Approach 1:
The functions of structural support and electrical connection are separated into different components. The support elastic member handles mechanical support while the separate elastic member handles electrical connection, eliminating the interference between structural deformation and electrical current application that caused unstable rotor driving.
3Device complexity
If a single leaf spring structure is used, then device complexity is reduced, but twist or heving phenomenon occurs affecting rotor performance
Solution Approach 1:
The single leaf spring structure is segmented into a support elastic member and a separate elastic member. Although this increases the number of components slightly, it eliminates the problematic twist and heving phenomena, thereby improving overall rotor driving performance and reliability.
Solution Approach 2:
The support elastic member and separate elastic member work together as a unified system where each component has a specialized function. The support elastic member provides structural support while the separate elastic member provides electrical connection, creating a multi-functional assembly that outperforms the single integrated structure.
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 inhibits the elastic member from being bent, tilted, or heaved, thereby improving the driving stability of the rotor and enhancing the quality of the image obtained by the camera module.
Implementation Method 1
an elastic member including a first elastic member coupled to the rotor and electrically connected the first connection terminal and a second elastic member coupled to the rotor and electrically connected the second connection terminal
Implementation Method 2
a VCM comprising: a rotor having a first driving unit and arranged therein with a lens; a stator having a second driving unit wrapping the first driving unit and being opposite to the first driving unit
Data Source
AI summary
A VCM is disclosed, the VCM including a rotor having a first driving unit and arranged therein with a lens, a stator having a second driving unit wrapping the first driving unit and being opposite to the first driving unit, a base supporting the stator and having an opening formed at a position corresponding to that of the lens, a connection terminal including a pair of first and second connection terminals arranged at an upper surface of the base, and an elastic member including a first elastic member coupled to the rotor and electrically connected the first connection terminal and a second elastic member coupled to the rotor and electrically connected the second connection terminal.