OIS Actuator Magnet Layout to Prevent Tilt Separation
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Solution Overview
Problem
Existing camera devices face challenges in implementing optical image stabilization (OIS) functions while minimizing magnetic field interference and preventing mechanical separation of moving parts during axis tilting.
Innovation Solution
An actuator device with a housing, holder, reflective member, and drive units that utilize magnets and coils to tilt the holder about two perpendicular axes, ensuring the centers of the magnets are aligned and spaced apart to minimize interference and separation, using eccentric arrangements to control current direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first attractive member and second attractive member are aligned with the first axis, then the tilt control is simplified, but mechanical separation occurs during tilting
Solution Approach 1:
The patent applies asymmetry by intentionally misaligning the first attractive member and second attractive member from the first axis. The imaginary straight line connecting the centers of the two attractive members is spaced apart from the first axis, creating an asymmetric configuration that prevents mechanical separation during tilting while maintaining effective tilt control through the magnetic attraction mechanism.
2Volume of moving object
If magnets are positioned closer together, then the device size is reduced, but magnetic field interference increases
Solution Approach 1:
The patent applies local quality by positioning the first attractive member and second attractive member at specific locations that are spaced apart from each other and from the first axis. This local arrangement creates zones of magnetic attraction that work together to tilt the holder while minimizing magnetic field interference between the two magnets, achieving a balance between compact size and reduced interference.
3Reliability
If the holder is tilted about the first axis with aligned magnets, then the OIS function is achieved, but noise and mechanical separation occur
Solution Approach 1:
The asymmetric positioning of the first and second attractive members relative to the first axis eliminates mechanical separation during tilting operations. The misalignment ensures that the holder tilts smoothly about the first axis without the moving plate separating from the holder, thereby reducing noise and improving OIS function reliability.
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
Improves performance by reducing mechanical separation and noise, enhancing the stability and efficiency of OIS functions in camera devices.
Implementation Method 1
a first drive unit that tilts the holder about a first axis... The first drive unit comprises a first driving magnet and a first coil
Implementation Method 2
a second drive unit that tilts the holder with respect to a second axis perpendicular to the first axis... The second drive unit comprises a second driving magnet and a second coil
Implementation Method 3
a first attractive member being disposed on the holder; and a second attractive member being disposed on the housing and acting an attractive force with the first attractive member
Data Source
AI summary
An embodiment of the present invention relates to an actuator device comprising: a housing; a holder which is disposed in the housing; a reflective member which is disposed in the holder; a first drive unit which tilts the holder about a first axis; a first attractive member which is disposed in the holder; and a second attractive member which is disposed in the housing and has attraction with the first attractive member, wherein a first imaginary straight line connecting the center of the first attractive member to the center of the second attractive member is spaced apart from a second imaginary straight line passing through the first axis and parallel to the first straight line.