Image Sensor OIS Suspension for 3-Axis Stabilization
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Solution Overview
Problem
Recent camera devices face challenges in securing electromagnetic force to move heavier lenses with increasing pixel density, making it difficult to achieve effective image stabilization within limited spaces.
Innovation Solution
The camera device moves the image sensor in three axes (x-axis shift, y-axis shift, and z-axis rolling) using a wire and damper system, where the damper is strategically placed to inhibit oscillation and enhance stability during optical image stabilization and autofocus operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens diameter is increased to accommodate higher pixel density, then the image quality is improved, but the lens weight increases making it difficult to secure electromagnetic force for movement
Solution Approach 1:
Instead of moving the lens to achieve image stabilization, the patent inverts the approach by moving the image sensor in the opposite direction to compensate for shaking. This allows the heavy lens to remain stationary while the lighter image sensor is moved using electromagnetic force, resolving the contradiction between lens weight and stabilization capability
Solution Approach 2:
The patent introduces a wire as an intermediary element that connects the image sensor to the housing. The wire allows the image sensor to move relative to the housing while maintaining electrical connections, enabling the image sensor to be moved by electromagnetic force without requiring the lens to be moved
2Measurement precision
If the image sensor is moved to achieve image stabilization, then image quality is improved, but oscillation occurs during movement
Solution Approach 1:
The patent applies dampers at specific locations (first damper between housing and wire, second damper between wire and image sensor) to provide beforehand cushioning against oscillation. These dampers are positioned to counteract vibrations that occur during image sensor movement, ensuring stable imaging while maintaining the ability to move the sensor for stabilization
3Adaptability or versatility
If the wire is used to movably support the image sensor, then image sensor movement is enabled, but foreign substances may ingress through the wire passage
Solution Approach 1:
The patent uses a flexible wire to connect the image sensor with the housing. The wire passes through the housing wall, creating a passage that could allow foreign substance ingress. The wire itself acts as a flexible barrier that maintains electrical connectivity while allowing movement, and its presence in the passage helps prevent foreign substances from entering the internal space
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
This solution allows for effective image stabilization by moving the image sensor, reduces oscillation, and enhances anti-dust protection while maintaining structural integrity and preventing foreign substance ingress, thus improving image quality and device reliability.
Implementation Method 1
a first damper connecting the housing and the wire... a second damper connecting the bobbin and the upper elastic member
Data Source
AI summary
The present embodiment relates to a camera device that performs optical image stabilization (OIS) by moving an image sensor. The camera device can drive the image sensor along three axes, that is, an x-axis shift, a y-axis shift, and a z-axis rolling, and comprises: a base; a housing disposed on the base; an image sensor disposed in the base; a wire movably supporting the image sensor, and a first damper that connects the housing and the wire, wherein the housing is fixed to the base.