Lens Driving Unit Support Structure for Low-Power OIS Reliability
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Solution Overview
Problem
Existing voice coil motor technologies are difficult to apply to miniature low-power camera modules, leading to increased power consumption and reliability issues due to reduced diameter of OIS wires, especially in small electronic devices prone to shocks and shaking.
Innovation Solution
A lens moving apparatus with a housing, bobbin, coil, magnet, elastic members, and conductive patterns that reduce current intensity and improve reliability by optimizing conductive connections and support structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of OIS wire is reduced to fit miniature camera modules, then the device size is reduced, but power consumption increases and reliability deteriorates
Solution Approach 1:
The patent introduces support members as intermediary components that provide dedicated conductive pathways from the bobbin to the base. These support members act as mediators between the OIS coil and the base, carrying current without requiring the main OIS wire to be thick, thus enabling miniaturization while maintaining reliability and low power consumption
Solution Approach 2:
The current path is segmented into multiple independent conductive support members rather than relying on a single thick OIS wire. Each support member carries a portion of the current, allowing the overall system to achieve the required current capacity without increasing the diameter of any single wire, thereby enabling camera module miniaturization
2Volume of moving object
If the diameter of OIS wire is reduced, then the camera module becomes more compact, but current intensity increases leading to higher power consumption
Solution Approach 1:
The current path is divided into multiple parallel conductive support members, distributing the current load across several pathways. This segmentation reduces the current intensity in each individual support member, thereby reducing power consumption (P=I²R) while maintaining the compact camera module design
Solution Approach 2:
The support members serve as intermediary conductive elements that provide optimized current pathways from the bobbin to the base. By designing these intermediaries with appropriate conductivity and geometry, the system achieves efficient current transmission with minimal power loss, enabling compact design without excessive power consumption
3Volume of moving object
If the diameter of OIS wire is reduced, then the camera module becomes more compact, but reliability deteriorates due to increased current density
Solution Approach 1:
The current transmission function is segmented across multiple support members, reducing current density in each individual member. This segmentation prevents overheating and mechanical stress concentration, thereby maintaining high reliability in the compact camera module design
Solution Approach 2:
The support members act as specialized intermediary components designed specifically for current transmission in the compact configuration. They provide reliable conductive pathways that are optimized for the miniaturized structure, ensuring stable OIS driving performance without the reliability issues associated with reduced wire diameter
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
Reduces power consumption and inhibits reliability deterioration by minimizing current flow through support members, enhancing the performance of optical image stabilizer driving.
Implementation Method 1
a first coil disposed on the bobbin, a first magnet disposed on the housing
Implementation Method 2
a second coil disposed on the circuit board, a second magnet disposed on the bobbin
Implementation Method 3
an upper elastic member coupled both to the bobbin and to the housing
Data Source
AI summary
An embodiment comprises a housing, a bobbin disposed inside the housing, a first coil disposed on the bobbin, a first magnet disposed in the housing, an upper elastic member coupled to the bobbin and the housing, a circuit substrate disposed under the housing, a base which is disposed under the circuit substrate and includes a first hole, a conductive pattern disposed on the base and electrically connected to the circuit substrate, and a support member having one end coupled to the upper elastic member and the other end coupled to the conductive pattern, wherein the other end of the support member is coupled to the base through the first hole in the base.