Lens Driving Device OIS and Auto Focusing via Lorentz Force
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Solution Overview
Problem
Existing lens modules with optical image stabilization (OIS) functions in portable devices face challenges in miniaturization due to increased cost and complexity, delayed reset reliability, and assembly difficulties, particularly with the need for Hall sensors and suspension wires for auto focusing and stabilization.
Innovation Solution
A lens driving device incorporating a permanent magnet mounting base, drive coil, anti-shake coil, elastic parts, and bearing balls, which eliminates the need for Hall sensors and suspension wires by using Lorentz Force and elastic deformation to achieve OIS and auto focusing, simplifying assembly and improving reset reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Hall sensors and suspension wires are used for OIS and AF functions, then the optical image stabilization and auto focusing capabilities are achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the Hall sensor and suspension wire components from the traditional lens module structure. Instead of using these separate components for OIS and AF functions, the invention integrates the functionality directly into the lens driving mechanism through a simplified structure that achieves the same stabilization and focusing capabilities without the additional complexity
Solution Approach 2:
The patent merges the OIS and AF control functions into a unified lens driving mechanism. The lens driving device integrates multiple functions (OIS, AF, and lens movement control) into a single coordinated system, eliminating the need for separate Hall sensors and suspension wires that were previously required for these functions
2Reliability
If Hall sensors are added for lens position detection in OIS function, then the optical image stabilization performance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the Hall sensor component from the lens module structure. The invention achieves optical image stabilization performance through an alternative mechanism that does not require Hall sensors for lens position detection, thereby eliminating the associated manufacturing cost while maintaining functional performance
3Ease of operation
If suspension wires are provided for energizing AF coil, then the auto focusing function is achieved, but the assembly difficulty increases
Solution Approach 1:
The patent extracts and eliminates the suspension wire component from the lens module. The invention provides an alternative method for energizing the AF coil that does not require suspension wires, thereby simplifying the assembly process while maintaining the auto focusing functionality
Solution Approach 2:
The patent merges the electrical connection for the AF coil into the integrated lens driving structure. Instead of using separate suspension wires to deliver power to the AF coil, the invention incorporates the electrical connection directly into the lens driving mechanism, simplifying assembly
4Stability of the object's composition
If control circuit is used for lens recovery action, then the lens can return to base pivot position, but the reset time is delayed and reliability is reduced
Solution Approach 1:
The patent implements a self-service mechanism for lens recovery through elastic restoring forces. The lens structure incorporates elastic components that automatically return the lens to its base pivot position without requiring external control circuit intervention, achieving rapid and reliable reset while maintaining position stability
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 enables miniaturization of camera modules, reduces assembly complexity, and enhances production efficiency while providing rapid and reliable optical image stabilization and auto focusing capabilities without the need for Hall sensors or suspension wires.
Implementation Method 1
a drive coil... which eliminates the need for Hall sensors and suspension wires by using Lorentz Force
Implementation Method 2
anti-shake coil... by using Lorentz Force and elastic deformation to achieve OIS
Implementation Method 3
elastic parts... by using Lorentz Force and elastic deformation to achieve OIS and auto focusing
Implementation Method 4
bearing balls... which eliminates the need for Hall sensors and suspension wires
Data Source
AI summary
A lens driving device includes a housing having a base, an upper cover engaged with the base, and a receiving space formed by the base and the upper cover; a permanent magnet mounting base arranged on the base; a permanent magnet fixed on the permanent magnet mounting base; a lens barrel used for holding a lens group therein and movable along a direction parallel to an optic axis of the lens group; a driving coil surrounding an outer surface of the lens barrel, and opposite to the permanent magnet mounted on the permanent magnet mounting base; an anti-shake coil opposite to the permanent magnet mounted on the permanent magnet mounting base; an elastic part suspending and connecting with the lens barrel; an OIS elastic part fixed to an upper surface of the permanent magnet mounting base for restoring the permanent magnet mounting base to a predetermined position.