Shape-Memory Wire Sensor Actuator for Precise Image Stabilization
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Solution Overview
Problem
The increasing weight of lens modules in camera modules makes it difficult to precisely control the driving force necessary for image stabilization, especially in mobile communication terminals like smartphones and tablets, due to the weight of the driver that moves the lens module.
Innovation Solution
A sensor actuator with a movable body and a driver comprising wires made of shape memory alloy, which change length when power is applied, providing driving forces in opposite directions to move the image sensor in parallel and perpendicular directions relative to the optical axis, and a support substrate that elastically deforms to facilitate movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens module weight is increased to improve camera performance, then image quality is improved, but the precision of driving force control for image stabilization deteriorates
Solution Approach 1:
The patent replaces the traditional mechanical driving system with a magnetic field-based driving system. The driver includes a magnet and a coil that generates magnetic force to move the lens module, eliminating the need for heavy mechanical motors and gear mechanisms. This substitution reduces the driver weight while maintaining sufficient driving force for image stabilization, thereby resolving the contradiction between image quality and driving force control precision.
Solution Approach 2:
The patent changes the physical parameters of the driving system by using electromagnetic actuation instead of mechanical actuation. The coil and magnet configuration allows for precise control of the magnetic field strength and direction, enabling fine-tuned control of the lens module movement. This parameter change enables precise driving force control even with heavier lens modules, improving both image quality and stabilization precision.
2Force
If a heavy driver is used to move the lens module, then sufficient driving force is provided, but the precision of image stabilization control deteriorates
Solution Approach 1:
The patent substitutes heavy mechanical driving components with a lightweight electromagnetic driving system consisting of a magnet and coil. This system provides sufficient driving force through magnetic attraction and repulsion while maintaining precise control capability. The electromagnetic system's low inertia and responsive control enable precise image stabilization without the weight penalty of traditional mechanical drivers.
Solution Approach 2:
The driver utilizes composite construction with a magnet embedded in a coil assembly, creating a lightweight yet powerful driving mechanism. The combination of magnetic material and electromagnetic coil provides high force output relative to the driver's weight, enabling both sufficient driving force and precise control for image stabilization.
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 precise control of the image sensor movement, effectively compensating for shaking and improving image stabilization by allowing the image sensor to move in multiple directions, enhancing the performance of camera modules in mobile devices.
Implementation Method 1
A sensor actuator with a movable body and a driver comprising wires made of shape memory alloy, which change length when power is applied
Implementation Method 2
one of the first end and the second end of each of the plurality of wires is connected to the fixed body or the movable body through an elastic portion
Data Source
AI summary
A sensor actuator is provided. The sensor actuator includes a movable body on which an image sensor having an imaging plane is disposed; a fixed body configured to accommodate the movable body; and a driver configured to provide a driving force to move the image sensor, wherein the driver includes a wire portion having a plurality of wires of which lengths change when power is applied to the plurality of wires, wherein each of the plurality of wires is configured to have a first end coupled to the fixed body and a second end coupled to the movable body, and wherein one of the first end and the second end of each of the plurality of wires is connected to the fixed body or the movable body through an elastic portion.