Compact Lens-Shift OIS Structure Without a Third Frame
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Solution Overview
Problem
Modern camera modules in mobile devices face challenges in achieving a slim and compact design while providing effective optical image stabilization (OIS) due to the additional height and width penalties from using multiple OIS frames, which are necessary for correcting hand-shake movements in two directions perpendicular to the lens optical axis.
Innovation Solution
A lens-shift OIS mechanism is implemented using a moving frame and a static frame, with ball-bearings and voice coil motors (VCMs) to allow rotational and linear movements, eliminating the need for a third OIS frame, thereby reducing the module's height and width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple OIS frames are used to correct hand-shake movements in two directions, then image stabilization performance is improved, but module height and width increase
Solution Approach 1:
The patent combines multiple OIS frame functions into a single integrated frame structure. Instead of using separate frames for different correction directions, the invention merges them into one frame that performs both x-direction and y-direction hand-shake corrections through integrated ball-bearing mechanisms and voice coil motors, thereby reducing the overall module dimensions while maintaining dual-axis stabilization capability
Solution Approach 2:
The single OIS frame is designed to perform multiple functions simultaneously: it supports both rotational movement for x-direction correction and linear movement for y-direction correction. The frame incorporates multiple ball-bearing assemblies and voice coil motors that enable it to handle two-dimensional hand-shake compensation within one unified structure, eliminating the need for multiple specialized frames
2Volume of moving object
If a third OIS frame is added to reduce module dimensions, then compactness is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for a third OIS frame by redesigning the movement transmission mechanism. Instead of adding another frame layer, the invention removes redundant structural elements and uses a streamlined combination of ball-bearings and voice coil motors that directly transmit actuation forces, thereby reducing complexity while achieving compact dimensions
Solution Approach 2:
The patent replaces complex mechanical linkages with a simplified system using ball-bearing assemblies and voice coil motors. The ball-bearings provide precise rotational and linear movements through their inherent mechanical properties, while the voice coil motors provide direct electromagnetic actuation, eliminating the need for additional mechanical transmission components that would increase 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
The solution enables a slim and compact OIS module that effectively stabilizes images by correcting hand-shake movements in two directions, fitting seamlessly into mobile devices without increasing thickness or height, and allowing for faster and simpler actuation control.
Implementation Method 1
first, second and third ball-bearings defining an OIS plane and positioned between the moving frame and the static frame to allow a first movement and a second movement of the moving frame relative to the static frame
Implementation Method 2
ball-bearings and voice coil motors (VCMs) to allow rotational and linear movements
Data Source
AI summary
Optical image stabilization (OIS) mechanisms, comprising a moving frame including a first groove, a static frame including a second groove, an OIS actuator, and first, second and third bearings that define an OIS plane, wherein the first ball bearing is located in a rail formed by the first groove and the second groove, wherein the ball-bearings are positioned between the moving frame and the static frame and allow a first movement and a second movement of the moving frame relative to the static frame, wherein the first movement is a rotational movement performed around a rotation axis that coincides with the position of the first ball bearing and is perpendicular to the OIS plane, and wherein the second movement is a linear movement along the rail.