Voice Coil Motor Terminal Layout to Prevent Rotor Twist
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Solution Overview
Problem
Conventional camera modules with Voice Coil Motors (VCMs) face issues with the leaf spring causing twisting 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 suboptimal 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 or tilting by using separate connection members, ensuring stable electrical connections and preventing rotor misalignment.
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 heaving phenomenon is generated causing bad driving of the rotor
Solution Approach 1:
The patent divides the elastic member into two separate functional parts: a support portion that provides elastic support to the rotor, and a connection portion that connects to the base. This segmentation allows each part to perform its specific function without interfering with the other, preventing the twist and heaving phenomena that occur when the terminal unit is bent into the leaf spring structure.
Solution Approach 2:
The patent introduces a separate connection terminal as an intermediary component between the elastic member and the base. Instead of directly bending the terminal unit into the elastic member, the connection terminal mediates the electrical connection, allowing the elastic member to maintain its structural integrity while still providing electrical connectivity through the intermediary terminal.
2Ease of manufacture
If the terminal unit is bent to the leaf spring, then electrical connection is achieved, but the rotor is generated with bad driving
Solution Approach 1:
The patent segments the electrical connection function from the elastic support function. The connection portion handles electrical connectivity while the support portion handles mechanical support, eliminating the manufacturing complexity and reliability issues associated with bending the terminal unit into the leaf spring structure.
Solution Approach 2:
The connection terminal serves as an intermediary that simplifies manufacturing by providing a dedicated electrical connection point. This intermediary approach eliminates the need to bend terminal units into the elastic member, thereby maintaining rotor driving performance while achieving electrical connection.
3Device complexity
If the elastic member is used to support the rotor and apply driving current, then dual function is achieved, but twist or heaving phenomenon occurs
Solution Approach 1:
The patent divides the elastic member into distinct support and connection portions with different functional requirements. The support portion is optimized for elastic support without electrical connection demands, while the connection portion handles electrical connectivity. This segmentation maintains low device complexity by using a single integrated member while eliminating stability issues.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the elastic member. The support portion has structural characteristics optimized for elastic support, while the connection portion has characteristics optimized for electrical connection. This local differentiation allows each part to perform its function without causing twist or heaving phenomena.
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 preventing bad driving of the rotor, allowing for improved adjustment of the lens and image sensor gap, enhancing image quality.
Implementation Method 1
a coil block formed by winding an insulated long resin-coated wire in a cylinder shape
Implementation Method 2
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
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.