Camera Module Three-Axis OIS via Coupled Lens-Sensor Rotation
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Solution Overview
Problem
Conventional camera modules with OIS structures can only stabilize images in yawing and pitching directions, failing to correct handshake caused by rolling movements, which affects image quality, especially at the edge regions of the image sensor.
Innovation Solution
A camera module design that incorporates a module tilt method, where the lens and image sensor move together, enabling three-way image stabilization in yawing, pitching, and rolling directions using a guide member and electromagnetic interaction between coils and magnets to adjust the distance and orientation of the lens and image sensor, maintaining image quality from the central to the edge region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-axis OIS structure is used, then yawing and pitching stabilization is achieved, but rolling stabilization cannot be corrected
Solution Approach 1:
The patent transitions from two-axis (yawing/pitching) to three-axis (adding rolling) image stabilization by introducing a rotational actuator that enables the lens barrel to rotate around the optical axis, thereby expanding the stabilization capability to all three rotational degrees of freedom
Solution Approach 2:
The lens barrel is designed to perform multiple functions: it not only focuses light but also serves as a rotating platform for three-axis OIS. The rotational mechanism allows the same structural component to handle both focusing and multi-directional stabilization tasks
2Reliability
If lens and image sensor move separately, then traditional OIS is achieved, but image quality degradation occurs at edge regions
Solution Approach 1:
The patent merges the movement of the lens and image sensor by coupling them through the rotational mechanism. When the lens barrel rotates for rolling stabilization, the image sensor rotates together with the lens, maintaining their relative positional relationship and preventing image quality degradation at edge regions
Solution Approach 2:
The rotational actuator serves as an intermediary that couples the lens and image sensor movements. It transmits the rotational motion to both components simultaneously, ensuring they move together as a unified system rather than independently
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 camera module achieves effective three-way image stabilization, preventing image quality degradation across the entire image sensor area, even when moving the lens and image sensor together, unlike traditional methods that separate their movements.
Implementation Method 1
electromagnetic interaction between coils and magnets to adjust the distance and orientation of the lens and image sensor
Data Source
AI summary
The present embodiment relates to a camera module comprising: a housing including a first surface; a holder including a lens, and including a second surface which faces the first surface and is formed on the outer surface of the holder; and a guide member disposed between the first surface and the second surface, wherein the first surface and the second surface have curved surfaces, the curved surface of the second surface is a curved surface of which the central portion further protrudes outward than the top and bottom thereof, and the curved surface of the first surface is a curved surface of which the central portion is more recessed than the top and bottom thereof.