Lens Driving Device Anti-Shake Spring Reset Mechanism
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Solution Overview
Problem
Existing lens modules with optical image stabilization (OIS) functions face challenges in miniaturization due to increased cost and complexity, delayed recovery, and assembly difficulties, particularly in integrating suspension wires for auto focusing (AF) and lens stabilization.
Innovation Solution
A lens driving device incorporating a housing with a lens barrel, anti-shake carrier, permanent magnets, focusing and anti-shake coils, flexible printed circuit board, and elastic springs, which eliminates the need for Hall sensors and simplifies the assembly by using electromagnetic forces and elastic deformation for stabilization and focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Hall sensors are used to determine lens position for optical image stabilization, then stabilization function is achieved, but device complexity and cost increase
Solution Approach 1:
The patent removes the Hall sensor from the lens module structure, extracting the position detection function and replacing it with a purely mechanical spring-based reset mechanism. This eliminates the need for electronic sensors while maintaining the optical image stabilization capability through electromagnetic actuation alone.
Solution Approach 2:
The spring component provides automatic reset functionality without requiring external control circuits or sensors. When the lens moves from its initial position during stabilization, the spring accumulates elastic energy and automatically returns the lens to its initial position when the electromagnetic force is removed, enabling self-service recovery.
2Measurement precision
If control circuits are used to accomplish lens recovery to initial position, then positioning is achieved, but recovery time is delayed and reliability decreases
Solution Approach 1:
The patent replaces the electronic control circuit-based recovery mechanism with a mechanical spring-based recovery system. The spring provides immediate physical restoration force when electromagnetic actuation stops, eliminating the delay inherent in electronic control loops and significantly reducing recovery time.
Solution Approach 2:
The spring is pre-loaded during lens movement, storing elastic energy in advance. This preliminary energy storage enables instant recovery action when needed, rather than waiting for control circuit processing and signal transmission delays.
3Adaptability or versatility
If suspension wires are added for auto focusing function, then focusing capability is achieved, but assembly difficulty increases and production efficiency decreases
Solution Approach 1:
The patent combines the auto-focusing suspension mechanism with the existing electromagnetic actuation system. The same electromagnetic coil structure that provides optical image stabilization also serves as the actuator for auto-focusing, eliminating the need for separate suspension wires and reducing assembly complexity.
Solution Approach 2:
The electromagnetic coil assembly serves multiple functions: it provides both optical image stabilization (by moving the lens perpendicular to the optical axis) and auto-focusing (by moving the lens along the optical axis). This multi-functionality eliminates the need for separate mechanical suspension components.
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, reduces production costs, improves recovery reliability, and simplifies assembly by integrating OIS and AF functions without Hall sensors, enhancing the overall efficiency and performance of camera modules.
Implementation Method 1
the anti-shake spring (70) connected to said anti-shake carrier (40), wherein, when said anti-shake carrier (40) moves away from an initial position, said first inner ends (77, 97) and second inner ends (81, 101) of said anti-shake spring (70) are deformed; and when said anti-shake carrier (40) is restored to said initial position, said first inner ends (77, 97) and second inner ends (81, 101) of said anti-shake spring (70) are restored
Implementation Method 2
a focusing coil (39) wound on said lens barrel (30), wherein said focusing coil (39) is connected with said flexible printed circuit board (50), said flexible printed circuit board (50) supplies power with said focusing coil (39)
Implementation Method 3
an anti-shake coil (49) arranged in said housing (11) and set oppositely to said permanent magnet (47), wherein said anti-shake coil (49) is connected with said flexible printed circuit board (50)
Data Source
AI summary
A lens driving device is disclosed. The lens driving device includes a housing including a base, and a cover body forming a receiving space together with the base; a lens barrel assembled inside the housing and moveable along an optical axis of the lens barrel; an anti-shake carrier assembled inside the housing for suspending the lens barrel along the optical axis; an anti-shake spring having one end thereof fixed to the housing, and another end fixed on the anti-shake carrier; a plurality of bearing steel balls provided between the base and the anti-shake carrier for reducing friction force when the anti-shake carrier moves perpendicular to the optical axis; wherein the anti-shake carrier depends on elastic force of the anti-shake spring when it moves perpendicular to the optical axis, and the anti-shake carrier will return to an initial position.