Camera Module Sensor-Shift OIS for Heavy Lens Stabilization
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Solution Overview
Problem
The increasing diameter and weight of camera lenses due to high pixelation make it difficult to secure sufficient electromagnetic force to move the lens for image stabilization within a limited space, complicating the implementation of optical image stabilization (OIS) in camera devices.
Innovation Solution
A camera device design that moves the image sensor in three axes (x-axis shift, y-axis shift, and z-axis roll) using a first and second drive part, connected by a connection substrate and elastic members, allowing for image stabilization without relying on moving the lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens diameter is increased to achieve high pixelation, then image quality is improved, but the weight of the lens increases and electromagnetic force becomes insufficient for image stabilization
Solution Approach 1:
Instead of moving the lens for image stabilization (conventional OIS), this patent moves the image sensor in the opposite direction to achieve the same stabilization effect. This inversion allows the use of a heavier lens for high pixelation while maintaining stabilization capability through sensor movement rather than lens movement.
Solution Approach 2:
The patent introduces an elastic member (leaf spring) as an intermediary between the fixed part and the moving part containing the image sensor. This elastic member enables the moving part to be displaced in the optical axis direction while maintaining connection, facilitating sensor movement for stabilization without requiring direct mechanical coupling.
2Measurement precision
If the lens diameter is increased for high pixelation, then image quality is improved, but the space available for electromagnetic components is reduced
Solution Approach 1:
The patent inverts the conventional approach by moving the image sensor instead of the lens. This eliminates the need for electromagnetic components to move the lens, reducing space requirements and simplifying the device structure while maintaining image stabilization functionality.
Solution Approach 2:
The patent replaces the electromagnetic-mechanical lens driving system with a mechanical elastic member-based sensor positioning system. The elastic member (leaf spring) provides the necessary mechanical compliance and positioning without requiring complex electromagnetic actuators, thereby reducing device complexity and space requirements.
3Reliability
If the image sensor is moved in three axes for stabilization, then image stabilization is achieved, but the structural complexity increases
Solution Approach 1:
The patent combines multiple functions into the moving part structure: the moving part simultaneously holds both the lens and the image sensor, and the elastic member provides both mechanical support and positioning compliance. This merging reduces the number of separate components and simplifies the overall structure while enabling three-axis sensor movement for stabilization.
Solution Approach 2:
The patent utilizes the elastic properties of the leaf spring to provide compliant positioning in the optical axis direction while maintaining rigid positioning in perpendicular directions. By changing the mechanical parameters (elasticity, geometry) of the connecting member, the system achieves multi-degree-of-freedom movement capability without proportionally increasing structural 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
Enables effective image stabilization by managing resonant frequency and minimizing noise, while facilitating design for resonant frequency management and tolerance through the use of leaf springs and metal springs as ground lines.
Implementation Method 1
a first elastic member for connecting the fixed part and the second movement part
Implementation Method 2
the first elastic member may comprise a leaf spring
Data Source
AI summary
The first embodiment of the present invention may comprise: a fixed part including a first substrate; a first movement part disposed in the fixed part and including a lens; a second movement part disposed in the fixed part and including an image sensor; a first drive part for moving the first movement part in an optical axis direction; a second drive part for moving the second movement part in a direction perpendicular to the optical axis direction; a connection substrate for connecting the first substrate and the second movement part; and a first elastic member for connecting the fixed part and the second movement part.