SMA Wire Sensor Actuation for Camera Tilt Correction
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Solution Overview
Problem
Existing camera devices require complex spring structures and multiple elastic members for lens barrel movement, leading to complicated assembly processes and difficulty in tilt correction, which complicates the module structure and increases production time.
Innovation Solution
A sensor driving device utilizing shape memory alloy wires for relative movement between the lens barrel and image sensor, allowing for X-axis, Y-axis, and Z-axis movement, as well as tilt correction, without the need for traditional elastic members or magnets, simplifying the structure and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional spring structures and multiple elastic members are used for lens barrel movement, then the lens barrel can be moved relative to the image sensor, but the module structure becomes complicated and assembly processes increase
Solution Approach 1:
The patent combines multiple elastic members into a single integrated elastic plate structure. The elastic plate includes multiple elastic portions that collectively provide the necessary elastic forces for lens barrel movement in multiple directions, eliminating the need for separate springs and elastic wires, thus simplifying the module structure while maintaining the required movement capability
Solution Approach 2:
The elastic plate serves multiple functions simultaneously: it provides elastic support for lens barrel movement, enables tilt correction, and acts as a structural connector between the lens barrel and image sensor. This multi-functional design replaces what would traditionally require multiple specialized components, reducing assembly complexity
2Adaptability or versatility
If multiple elastic members are used for lens barrel movement, then the lens barrel can be moved in multiple directions, but the number of assembly processes increases
Solution Approach 1:
Multiple elastic members are merged into a single elastic plate with multiple elastic portions. This integrated structure provides multi-directional movement capability through its geometric design rather than through multiple separate components, significantly reducing the number of assembly steps required
3Ease of operation
If traditional spring structures are used, then the lens barrel can be moved, but tilt correction becomes difficult and assembly complexity increases
Solution Approach 1:
The elastic plate is designed with different local properties: some regions have higher elasticity for movement, while other regions are designed with specific geometric features that enable tilt correction. This localized functional differentiation allows both movement and tilt correction capabilities within a single integrated 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 stable image stabilization and autofocus functions with a simplified structure, reducing product cost and thickness by eliminating the need for magnets or coils, and allowing for improved 5-axis hand shake correction.
Implementation Method 1
a first wire part of a shape memory alloy having both ends connected to the first pad and moving the moving part with respect to the fixed part
Implementation Method 2
a second wire part having one end connected to the first lead pattern part and the other end connected to the moving part to elastically support the moving part
Data Source
AI summary
A sensor driving device according to an embodiment includes a fixed part including a first substrate on which a first lead pattern part and a first pad are formed; a moving part spaced apart from the fixed part and including a sensor; and a wire part disposed between the moving part and the fixed part, wherein the wire part includes a first wire part of a shape memory alloy having both ends connected to the first pad and moving the moving part with respect to the fixed part; and a second wire part having one end connected to the first lead pattern part and the other end connected to the moving part to elastically support the moving part.