Camera Module Shaking Correction Driver Design
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Solution Overview
Problem
Existing camera modules with optical image stabilization (OIS) functions face limitations in precisely correcting continuous shaking, particularly during video shooting, as they rely on simple lens module movement perpendicular to the optical axis.
Innovation Solution
A camera module design incorporating a shaking correction driver with magnets and coils, along with position sensors, allows for precise movement of the lens module on a plane perpendicular to the optical axis, utilizing multiple polarity regions and ball members for enhanced stability and vibration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple lens module movement mechanism is used for OIS, then the device structure is simple, but the shaking correction precision is insufficient for continuous shaking
Solution Approach 1:
The shaking correction driver is divided into multiple independent sub-drivers (first sub-driver with first OIS magnet and first OIS coil, second sub-driver with second OIS magnet and second OIS coil). Each sub-driver handles specific directional correction, allowing precise multi-axis shaking correction while maintaining modular structure that simplifies manufacturing and assembly.
Solution Approach 2:
Different polarity regions are created on the OIS magnets (first polarity region and second polarity region with different areas) to generate direction-specific magnetic forces. The position sensors are strategically placed at different locations (first position sensor closer to optical axis, second position sensor farther) to detect specific positional parameters, enabling precise local control for shaking correction.
2Measurement precision
If multiple position sensors are used to detect lens module position, then the position detection accuracy is improved, but the device complexity increases
Solution Approach 1:
Different position sensors are placed at specific locations to detect different positional parameters. The first position sensor is positioned closer to the optical axis to detect one parameter, while the second position sensor is positioned farther to detect another parameter. This strategic local placement enables comprehensive position detection with a minimal number of sensors.
Solution Approach 2:
The position sensors serve multiple functions: they detect the position of the lens module relative to the housing, provide feedback for the shaking correction driver to generate appropriate driving forces, and enable both first and second directional shaking corrections through the respective sub-drivers.
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 camera module achieves precise correction of shaking, enabling improved OIS performance and 3-axis shake correction, enhancing image stability in portable electronic devices.
Implementation Method 1
a shaking correction driver configured to form driving force to move the lens module on a plane perpendicular to an optical axis
Implementation Method 2
three or more position sensors, wherein the shaking correction driver is configured to form driving force
Data Source
AI summary
A camera module including a lens module, a carrier accommodating the lens module, a housing accommodating the carrier, and a shaking correction driver including a plurality of magnets disposed on the lens module, a plurality of coils disposed on the housing, and three or more position sensors, wherein the shaking correction driver is configured to form driving force to move the lens module on a plane perpendicular to an optical axis, wherein at least one of the plurality of magnets faces two or more position sensors, and wherein a position sensor facing one of the plurality of magnets is disposed closer to the optical axis than a position sensor facing an other of the plurality of magnets.