Camera OIS Actuator Magnet Segmentation for Stable Holder Tilt
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Solution Overview
Problem
Existing camera devices face challenges in minimizing magnetic field interference between magnets, which affects the stability and performance of optical image stabilization (OIS) functions.
Innovation Solution
The actuator device incorporates a holder with a reflective member and a magnetic configuration where the first driving magnet has regions with alternating polarities, minimizing magnetic field interference by using a second magnet to generate repulsive forces and a coil for tilting the holder, while maintaining stable driving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnets are used for driving the reflective member, then driving force is provided, but magnetic field interference occurs between magnets
Solution Approach 1:
The first driving magnet is divided into multiple regions (first region, second region, third region, fourth region) with alternating polarities. This segmentation allows the magnetic field to be distributed in a controlled manner, reducing interference with the second magnet while maintaining sufficient driving force on the reflective member.
Solution Approach 2:
Different regions of the first driving magnet have different polarity configurations tailored to their specific functions. The first and third regions (with same polarity) provide repulsive force to counteract gravitational force, while the second and fourth regions (with opposite polarity) provide attractive force to generate tilting moment. This local differentiation optimizes both driving force and interference reduction.
2Reliability
If multiple magnets are arranged to provide driving force, then OIS function is enabled, but magnetic field interference affects stability
Solution Approach 1:
The patent converts the potentially harmful magnetic field interference into a beneficial configuration by strategically arranging alternating polarities. The interference pattern is designed to create balanced forces that stabilize the reflective member during OIS operation, transforming what could be a destabilizing factor into a stabilizing mechanism.
3Power
If magnet size is increased to provide sufficient force, then driving performance improves, but magnetic field interference increases
Solution Approach 1:
Instead of using a single large magnet, the design segments the magnetic structure into multiple regions with alternating polarities. This segmentation allows the magnetic field to be distributed more efficiently, providing sufficient total force while reducing the concentration of magnetic flux that causes interference.
Solution Approach 2:
The patent changes the magnetic field distribution parameters by introducing alternating polarities in different regions. This parameter change optimizes the balance between total driving force and local field intensity, achieving high power output while minimizing interference effects.
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 minimizes magnetic field interference, ensuring stable driving performance and reinforcing the force of the holder, thereby enhancing the OIS function in camera devices.
Implementation Method 1
a second magnet generating a repulsive force with the first magnet
Implementation Method 2
the first region of the first driving magnet may have a polarity different from that of the first surface of the second magnet
Data Source
AI summary
The actuator device according to the present embodiment comprises: a holder; a reflective member disposed on the holder; a rigid mover coupled to the holder; a first magnet disposed on the rigid mover; a second magnet generating a repulsive force with the first magnet; and a first driving magnet for tilting the holder, wherein the first driving magnet comprises a first surface in a direction directing toward the reflective member, wherein the second magnet comprises a first surface in a direction directing toward the reflective member, wherein the first surface of the first driving magnet comprises a first region that is the most adjacent to the second magnet, and wherein a first region of the first driving magnet having a polarity different from that of the first surface of the second magnet.