Folded Camera AF and OIS Using Lens Shift and OPFE Tilt
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Solution Overview
Problem
Existing folded-lens dual-aperture cameras face challenges in maintaining compact size while incorporating auto-focus (AF) and optical image stabilization (OIS) mechanisms, as conventional OIS solutions increase camera height and introduce image roll and computational complexity.
Innovation Solution
The OIS functionality is divided between lens module movement along the Y axis and OPFE tilt around the Y axis, using flexible hanging members and coil-magnet pairs to achieve AF and OIS without increasing module height, and incorporating a controller to manage these movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OIS solutions are used in folded-lens dual-aperture cameras, then image stabilization is achieved, but camera height increases and computational complexity increases
Solution Approach 1:
The OIS function is segmented between two independent components: the lens module (which moves along the Y axis) and the OPFE (which tilts around the Y axis). This division allows each component to perform a simplified stabilization task, achieving effective image stabilization while maintaining a compact camera height without requiring complex computational algorithms.
2Reliability
If conventional OIS solutions are used in folded-lens dual-aperture cameras, then image stabilization is achieved, but device complexity increases
Solution Approach 1:
By segmenting the OIS function between lens module movement and OPFE tilt, the patent eliminates the need for complex computational image stabilization algorithms. Each physical component handles a specific aspect of stabilization, reducing computational complexity while maintaining effective image stabilization performance.
3Length of stationary object
If lens module moves along Y axis and OPFE tilts around Y axis for OIS, then camera height is maintained, but coordination control is required
Solution Approach 1:
The controller is designed with multi-functionality to simultaneously manage autofocus (Z axis lens movement), optical image stabilization (Y axis lens movement and Y axis OPFE tilt), and coordinate control between these functions. This universal control approach manages the coordination requirements efficiently without significantly increasing device complexity.
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 approach maintains a compact camera design by effectively compensating for camera tilt, reducing computational complexity, and ensuring high-quality image stabilization without increasing the camera's physical height.
Implementation Method 1
coil-magnet pairs to achieve AF and OIS
Implementation Method 2
flexible hanging members
Data Source
AI summary
Compact folded camera modules having auto-focus (AF) and optical image stabilization (OIS) capabilities and multi-aperture cameras including such modules. In an embodiment, a folded camera module includes an optical path folding element (OPFE) for folding light from a first optical path with a first optical axis to a second optical path with a second optical axis perpendicular to the first optical axis, an image sensor and a lens module carrying a lens with a symmetry axis parallel to the second optical axis. The lens module can be actuated to move in first and second orthogonal directions in a plane perpendicular to the first optical axis, the movement in the first direction being for auto-focus and the movement in the second direction being for OIS. The OPFE can be actuated to tilt for OIS.