Camera Actuator Magnet Eccentricity for Stable Tilt Driving
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Solution Overview
Problem
Existing camera devices face challenges in achieving stable and efficient optical image stabilization (OIS) and auto focus functions due to poor performance in first axis tilt driving, leading to potential separation and removal of moving parts during operation.
Innovation Solution
The actuator device incorporates a housing with a holder, a reflective member, a moving plate, and magnets to generate a repulsive force, utilizing a driving unit with coils and magnets to tilt the holder along both x and y axes, ensuring stable driving performance by eccentric disposition of magnets and controlled current application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional driving unit is used for tilting the holder, then the structure is simple, but the first axis tilt driving performance is poor and moving parts may separate
Solution Approach 1:
The patent applies asymmetry by eccentrically disposing the first magnet relative to the moving plate's central axis. This asymmetric positioning creates a repulsive force that generates both tilt torque and downward pressing force simultaneously, improving first axis tilt driving performance and preventing moving part separation without requiring additional structural components
Solution Approach 2:
The patent utilizes the vertical dimension (z-axis) by positioning the first magnet such that its central axis is eccentric to the moving plate's central axis. This spatial arrangement in three dimensions allows the repulsive force to have both horizontal (tilt) and vertical (pressing) components, solving the instability problem through dimensional positioning rather than adding more parts
2Speed
If excessive force is applied during tilt driving, then the tilting speed increases, but the moving parts may separate and removal occurs
Solution Approach 1:
The eccentric positioning of the first magnet creates an asymmetric force distribution where the repulsive force naturally has both horizontal and vertical components. This allows the system to achieve fast tilt speed while the vertical component simultaneously presses the moving parts together, preventing separation even under high-speed operation conditions
Solution Approach 2:
The patent changes the spatial parameter (position) of the first magnet to be eccentric relative to the moving plate's central axis. This parameter change transforms the force characteristics, enabling the system to achieve both high tilt speed and high connection stability through a single driving action rather than requiring separate control mechanisms
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
This configuration improves the performance of first axis tilt driving, prevents separation of moving parts, and secures stable driving performance even under excessive force conditions, enhancing the camera's OIS and auto focus capabilities.
Implementation Method 1
a second magnet disposed in the housing and generating a repulsive force with the first magnet
Implementation Method 2
a driving unit for tilting the holder, wherein with respect to a first optical axis, the central axis of the first magnet may be disposed to be eccentric with the central axis of the moving plate
Data Source
AI summary
The present embodiment relates to an actuator device comprising: a housing; a holder disposed inside the housing; a reflective member disposed on the holder; a moving plate disposed between the housing and the holder; a rigid mover coupled to the holder; a first magnet disposed on the rigid mover; a second magnet disposed in the housing and generating a repulsive force with the first magnet; and a driving unit for tilting the holder, wherein with respect to a first optical axis, the central axis of the first magnet is disposed to be eccentric with the central axis of the moving plate.