Slim Compact Lens-Shift OIS Mechanism Without a Third Frame
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Solution Overview
Problem
Modern camera modules in mobile devices face challenges in achieving optical image stabilization (OIS) while maintaining a slim and compact form factor due to the additional height and width penalties imposed by the use of multiple OIS frames.
Innovation Solution
A lens-shift OIS mechanism utilizing a moving frame and a static frame, actuated by a voice coil motor or push-pull VCM, allows for rotational and linear movements to stabilize the lens without requiring 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 achieve optical image stabilization, then image stabilization performance is improved, but module height and width increase
Solution Approach 1:
The patent extracts and eliminates the third OIS frame from the traditional three-frame configuration, retaining only the first and second OIS frames. This reduction in structural components directly decreases the module height while maintaining the essential OIS functionality through the coordinated operation of the remaining frames.
Solution Approach 2:
The first and second OIS frames are designed to perform multiple functions: they provide both structural support and enable rotational movement for OIS correction. The grooves and ball-bearings in these frames facilitate both linear and rotational movements, allowing the system to achieve stabilization without requiring a separate third frame.
2Reliability
If multiple OIS frames are used to achieve optical image stabilization, then image stabilization performance is improved, but module width increases
Solution Approach 1:
By removing the third OIS frame from the system, the patent directly reduces the horizontal space occupied by the module. The first and second OIS frames are configured to work together within a compact width, eliminating the need for the additional spatial footprint required by a three-frame arrangement.
3Adaptability or versatility
If a third OIS frame is included in the OIS module, then rotational movement capability is improved, but device compactness deteriorates
Solution Approach 1:
The first and second OIS frames are designed with multi-functional capabilities, including grooves that enable both linear and rotational movements. The ball-bearings positioned between these frames facilitate rotational movement around the optical axis while the frames themselves provide structural support, eliminating the need for a separate third frame.
Solution Approach 2:
The ball-bearings act as intermediaries between the first and second OIS frames, enabling rotational movement without requiring a third frame. These ball-bearings are positioned in the space between the frames and facilitate the transmission of rotational motion while maintaining the compact structure.
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 corrects for hand-shake around two rotation axes, maintaining image stabilization without increasing the module's thickness or width, suitable for integration into smartphones and other mobile devices.
Implementation Method 1
actuated by a voice coil motor or push-pull VCM
Implementation Method 2
first, second and third ball-bearings defining an OIS plane and positioned between the moving frame and the static frame
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.