Lens Driving Structure With Elastic PCB Links for OIS Wire Stress
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Solution Overview
Problem
Conventional voice coil motor technology is difficult to apply to micro-scale camera modules with low power consumption, leading to increased stress on support members due to vibration or impact, causing operation failures and deterioration in optical image stabilization.
Innovation Solution
A lens moving apparatus with a housing, bobbin, coils, magnets, elastic members, and a circuit board design that includes an elastic connection portion and dampers to alleviate stress on support members, enhancing the auto-focusing and handshake correction functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the aperture of the lens is increased to achieve high resolution, then the image quality is improved, but the stress on the OIS wire increases causing deformation or disconnection
Solution Approach 1:
The support structure is divided into multiple elastic connection portions extending from different corners of the circuit board body. This segmentation distributes the stress from the lens assembly across multiple independent elastic connections, preventing any single wire or connection point from bearing excessive stress that would cause deformation or disconnection.
Solution Approach 2:
The patent uses elastic connection portions made of flexible elastic materials that can deform elastically under stress. These flexible elastic connections absorb mechanical stress through elastic deformation, protecting the OIS wire from permanent deformation or disconnection while maintaining structural support for the high-aperture lens assembly.
2Adaptability or versatility
If voice coil motor technology is used for conventional camera modules, then auto-focusing and OIS functions are achieved, but it is difficult to apply to micro-scale camera modules with low power consumption requirements
Solution Approach 1:
The patent replaces the conventional voice coil motor actuation system with a spring-based elastic mechanical system. The elastic connection portions and upper elastic member provide the necessary mechanical support and movement capability without requiring active electromagnetic actuation, significantly reducing power consumption while maintaining auto-focusing and OIS functionality in micro-scale camera modules.
3Volume of moving object
If the size of the camera module is reduced for mobile devices, then the device compactness is improved, but the support members become more susceptible to vibration-induced stress and deformation
Solution Approach 1:
The patent employs elastic connection portions made of flexible elastic materials that can deform under vibration stress and then return to their original position. This flexibility allows the miniaturized support structure to absorb vibration energy without permanent deformation, maintaining reliability in compact camera modules subjected to mobile device vibrations.
Solution Approach 2:
The elastic connection portions act as pre-configured cushioning elements that anticipate and absorb vibration stresses before they can cause damage. The elastic materials are selected and dimensioned to provide adequate stress absorption capacity, protecting the support members from vibration-induced failures in the compact camera module design.
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 design reduces stress on support members, improving the reliability and performance of micro-scale camera modules by minimizing vibration-induced failures and enhancing autofocus and handshake correction capabilities.
Implementation Method 1
a first coil disposed on the bobbin, a magnet disposed in the housing so as to correspond to the first coil, a second coil disposed under the housing so as to correspond to the magnet
Implementation Method 2
an upper elastic member coupled to the upper portion of the bobbin and to the upper portion of the housing, an elastic connection portion extending from the body
Data Source
AI summary
One embodiment comprises: a housing; a bobbin arranged in the housing; a first coil arranged on the bobbin; a magnet, which is arranged in the housing and corresponds to the first coil; an upper elastic member coupled to the top of the bobbin and the top of the housing; a second coil, which is arranged below the housing and corresponds to the magnet in the optical axis direction; a circuit board including a body arranged below the second coil, and a connective elastic part extending from the body; a base arranged below the body of the circuit board; and a support member having one end coupled to the upper elastic member, and having the other end coupled to the connective elastic part, wherein the connective elastic part includes a coupling part coupled to the other end of the support member, and a connection part for connecting the body and the coupling part.