Multi-Axis Optical Reflector Drive for Compact OIS
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Solution Overview
Problem
Existing optical image stabilization (OIS) methods for zoom lenses in mobile devices face challenges such as low space utilization, increased device volume, and difficulty in ensuring precision due to the physical constraints and load distribution of optical-reflectors, which affect the linear movement and driving power of the optical-reflector, leading to suboptimal image stabilization.
Innovation Solution
A multi-axial driving apparatus for optical-reflectors featuring a support frame with a groove rail, a middle frame with guide rails, and a base frame, utilizing balls for point-contact support and different magnet polarities to provide proportional driving forces in various directions, ensuring precise and independent movement of the optical-reflector in X- and Y-axial directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical-reflector is rotated in a certain direction to correct shaking of a photographed image, then optical image stabilization is achieved, but the load is applied in a specific direction and the driving power intensity is not functionally proportional to the movement, resulting in non-linear movement and reduced control precision
Solution Approach 1:
The patent divides the stabilization function into two independent rotational movements around two different axes. The first driving unit rotates the optical-reflector around a first axis, while the second driving unit rotates it around a second axis perpendicular to the first. This segmentation allows each axis to be controlled independently with its own driving force, achieving linear and proportional control for precise image stabilization without the non-linear movement problems of single-axis rotation.
2Ease of operation
If the same kind of magnets are used for driving the moving object in various directions, then driving capability is provided, but the magnetic fields of the magnets or the driving coils may interfere with each other, causing problems in precise driving
Solution Approach 1:
The patent applies different polarities to magnets positioned at different locations to create localized magnetic field zones that do not interfere with each other. Specifically, first magnets and second magnets are arranged with different polarities so that their magnetic fields are confined to respective regions, enabling independent control of the first and second driving units without magnetic field interference, thus maintaining both driving capability and precision.
3Adaptability or versatility
If zoom lens is installed standing on main board in direction perpendicular to main board, then optical functions are implemented, but portable terminal cannot ensure small and light design due to required space equal to height of zoom lens
Solution Approach 1:
The patent transitions from a conventional single-axis rotational stabilization method to a multi-axis rotational system. By introducing rotation around two perpendicular axes instead of one, the system achieves more efficient space utilization and better control precision without increasing the overall device volume, allowing the zoom lens to be installed in a compact configuration perpendicular to the main board while maintaining stabilization functionality.
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 solution enables precise optical image stabilization in all directions, minimizing the size of the apparatus, improving space utilization, and reducing power consumption while maintaining accurate control over the optical-reflector's movement, effectively addressing the limitations of existing OIS methods.
Implementation Method 1
an optical-reflector (110) to reflect light to a lens
Implementation Method 2
a first driving unit (150-1) configured to move the support frame (120) in a first direction on the basis of the middle frame (130)
Implementation Method 3
a second driving unit (150-2) configured to move the middle frame (130) in a second direction perpendicular to the first direction, on the basis of the base frame (140)
Implementation Method 4
when the hall sensor is used to sense the movement of the optical-reflector, namely the magnet mounted to the optical-reflector
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
An apparatus for driving an optical-reflector with a multi-axial structure includes a support frame having a first groove rail formed therein, an optical-reflector installed at the support frame to reflect light to a lens, a middle frame having a first guide rail corresponding to the first groove rail and a second groove rail formed therein, a base frame having a second guide rail formed corresponding to the second groove rail, a first driving unit configured to move the support frame in a first direction on the basis of the middle frame, and a second driving unit configured to move the middle frame in a second direction, perpendicular to the first direction, on the basis of the base frame.