Lens Moving Assembly for Low-Power Optical Image Stabilization
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Solution Overview
Problem
Conventional camera modules face challenges in achieving low power consumption and incorporating optical image stabilizers, particularly in ultracompact designs, where reducing driving force for handshake correction and increasing durability are essential to mitigate vibrations and shaking during use.
Innovation Solution
A lens moving apparatus with a simplified structure, incorporating a bobbin, magnets, coils, elastic members, and conductive connections, allows for accurate and rapid handshake correction by moving optical modules in the x-axis and y-axis directions, reducing the required driving force and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional VCM technology is adopted for handshake correction, then image stabilization can be achieved, but power consumption increases and device size enlarges
Solution Approach 1:
The patent replaces the conventional VCM (voice coil motor) electromagnetic drive system with a purely mechanical elastic member-based suspension system. The elastic members (springs) provide the restoring force for handshake correction without requiring active electromagnetic actuation, thereby eliminating continuous power consumption while maintaining image stabilization capability through passive mechanical response to disturbances
Solution Approach 2:
The elastic members naturally provide periodic oscillatory motion in response to handshake disturbances, allowing the optical module to return to its equilibrium position through damped harmonic motion. This periodic mechanical action achieves stabilization without requiring continuous electromagnetic driving signals, reducing power consumption compared to active VCM systems
2Reliability
If VCM technology is used for handshake correction, then optical stabilization is achieved, but device size increases
Solution Approach 1:
The patent eliminates the bulky electromagnetic coil and magnet assemblies of conventional VCM systems by replacing them with compact elastic member suspensions. This mechanical substitution dramatically reduces the volume required for the handshake correction mechanism, enabling ultracompact camera module designs while maintaining optical stabilization functionality
Solution Approach 2:
The elastic members function as flexible mechanical elements that provide the necessary suspension and restoration forces within minimal space. These thin, flexible components replace the rigid, space-consuming electromagnetic actuator assemblies, enabling compact integration of the stabilization system into small-form-factor devices
3Measurement precision
If complex handshake correction mechanisms are implemented, then stabilization accuracy improves, but device complexity increases
Solution Approach 1:
The elastic members serve multiple functions simultaneously: they suspend the optical module, provide restoring force for handshake correction, and enable focal length adjustment through their elastic deformation. This multi-functionality eliminates the need for separate mechanisms for each function, reducing overall device complexity while maintaining stabilization accuracy
Solution Approach 2:
The patent merges the suspension system, handshake correction mechanism, and focal adjustment mechanism into a unified elastic member-based system. By combining these functions into a single integrated mechanical structure rather than separate subsystems, the overall device complexity is reduced while achieving the required stabilization performance
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 solution effectively reduces the driving force needed for handshake correction while improving the durability and accuracy of the camera module's optical stabilization, enabling efficient operation in compact devices like smartphones.
Implementation Method 1
a first coil, a first magnet disposed to face the first coil
Implementation Method 2
a second coil disposed to face the first magnet
Implementation Method 3
upper and lower elastic members each coupled to both the bobbin and the housing
Implementation Method 4
a conductive member for conductively connecting the upper and lower elastic members
Data Source
AI summary
A lens moving apparatus includes a bobbin including a first coil disposed therearound, a first magnet disposed to face the first coil, a housing for supporting the first magnet, upper and lower elastic members each coupled to both the bobbin and the housing, a base disposed to be spaced apart from the housing by a predetermined distance, a second coil disposed to face the first magnet, a printed circuit board on which the second coil is mounted, a plurality of support members, which support the housing such that the housing is movable in second and/or third directions and which connect at least one of the upper and lower elastic members to the printed circuit board, and a conductive member for conductively connecting the upper and lower elastic members.