Image Sensor Shift Structure for Compact Camera Stabilization
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Solution Overview
Problem
The increasing weight of lenses due to higher pixel density in camera devices makes it difficult to secure electromagnetic force for moving the lens in a limited space, hindering effective handshake correction.
Innovation Solution
The camera device moves the image sensor in three axes (x-axis shift, y-axis shift, and z-axis rolling) using a driving unit and a connection substrate that connects the image sensor to a base, reducing the need for multiple magnets and minimizing material costs while allowing for reduced height dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens diameter is increased to achieve higher pixel density, then the image quality is improved, but the lens weight increases making it difficult to secure electromagnetic force for moving the lens in limited space
Solution Approach 1:
Instead of moving the heavy lens for handshake correction, the patent inverts the approach by moving the image sensor while keeping the lens stationary. This allows the same handshake correction function to be achieved without being constrained by the lens weight, thereby resolving the contradiction between improved image quality (requiring larger lens) and the ability to move the optical component for stabilization.
2Reliability
If multiple magnets are used to provide electromagnetic force for lens movement, then the handshake correction capability is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent applies the inversion principle by switching from lens-based OIS to sensor-based OIS. This eliminates the need for multiple magnets associated with lens movement, reducing device complexity while maintaining handshake correction capability through a single driving unit that moves the image sensor instead.
Solution Approach 2:
The common driving magnet structure is designed to provide electromagnetic force for moving the image sensor in multiple directions (x-axis, y-axis, and z-axis rolling) through a unified mechanism. This multi-functional design reduces the need for separate magnets for each movement direction, thereby simplifying the overall device structure while maintaining comprehensive handshake correction capability.
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 approach enables effective handshake correction, reduces material costs, and enhances assembly and productivity by using a common driving magnet structure and flexible connection substrates.
Implementation Method 1
there is a problem in that it is difficult to secure electromagnetic force for moving the lens in a limited space
Data Source
AI summary
The present embodiment relates to a camera device comprising: a first substrate; a base disposed on the first substrate; a second substrate spaced apart from the first substrate; an image sensor electrically connected to the second substrate; a holder disposed on the second substrate; a driving unit for moving the image sensor in a direction perpendicular to the optical axis direction with respect to the first substrate; and a connection substrate electrically connecting the first substrate and the second substrate, wherein the connection substrate comprises a first part fixed to the holder and a second part fixed to the base.