Voice Coil Motor Structure to Avoid OIS Suspended-Wire Breakage
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Solution Overview
Problem
Shrapnel-suspended-wire type OIS motors in mobile phone cameras face reliability issues due to the risk of suspended-wire breakage, which affects the stability and functionality of autofocus and optical image stabilization systems.
Innovation Solution
A voice coil motor design incorporating a frame, magnetic member, coil assembly, first resilient member, and positioning mechanism, which includes a first connection ring and positioning portions to reset the coil assembly and frame after movement, enhancing reliability by avoiding wire breakage and improving control precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If shrapnel-suspended-wire type motor is used, then cost is reduced, but reliability deteriorates due to suspended-wire breakage risk
Solution Approach 1:
The patent removes the vulnerable suspended-wire component from the motor structure and replaces it with a resilient member having elastic deformation capability. This extraction of the weak link eliminates the breakage risk while preserving the motor's functional performance and cost-effectiveness.
Solution Approach 2:
The patent changes the mechanical parameter of the connection element from rigid (suspended-wire) to elastic (resilient member with deformation capability). This parameter change allows the connection to accommodate movement and stress without breaking, thereby improving reliability while maintaining the simple and cost-effective design.
2Reliability
If ball-type motor with closed-loop system is used, then reliability is improved, but cost increases
Solution Approach 1:
The patent replaces the complex closed-loop control system with a resilient member-based elastic connection that passively maintains reliability through mechanical deformation. This substitution eliminates the need for expensive sensors and control circuits while achieving comparable or superior reliability through pure mechanical means.
3Reliability
If resilient member with elastic deformation capability is used, then reliability is improved by avoiding wire breakage, but device complexity increases
Solution Approach 1:
The resilient member serves itself by using its own elastic deformation capability to accommodate movement and prevent breakage. This self-service mechanism eliminates the need for additional protective structures or complex control systems, thereby improving reliability without significantly increasing device complexity.
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 voice coil motor provides high reliability and stability for autofocus and optical image stabilization functions, reducing the risk of wire breakage and ensuring precise movement of the lens module, thereby enhancing camera performance in mobile devices.
Implementation Method 1
a coil assembly received in an inner cavity of the frame, a magnetic member disposed around the coil assembly
Implementation Method 2
The first positioning portion is configured to reset the coil assembly after movement of the coil assembly relative to the frame
Implementation Method 3
A positioning mechanism is disposed between the frame and the base and configured to reset the frame after movement of the frame relative to the base
Data Source
AI summary
A voice coil motor is provided in the disclosure. The voice coil motor includes a frame, a magnetic member disposed at the frame, a coil assembly received in an inner cavity of the frame, a first resilient member, a planar coil, and a base. The magnetic member is disposed around the coil assembly. The planar coil is disposed on the base. The frame is disposed on the planar coil. The first resilient member includes a first connection ring connected to the coil assembly and a first positioning portion. The coil assembly is connected to the frame via the first positioning portion. The first positioning portion is configured to reset the coil assembly after movement of the coil assembly relative to the frame. A positioning mechanism is disposed between the frame and the base and configured to reset the frame after movement of the frame relative to the base.