OIS Camera Module Structure for Tilt-Based Shake Correction
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Solution Overview
Problem
The miniaturization of portable devices such as smartphones and tablets leads to increased image shaking during photography, particularly with higher magnification, necessitating effective shake correction methods like optical image stabilization (OIS) and digital IS (DIS) to maintain image quality.
Innovation Solution
A camera module design incorporating a lens assembly, image sensor, OIS carrier, and a frame with OIS coils and magnets that allow for the tilting of the lens and image sensor to compensate for shake, using electromagnetic interactions to stabilize the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module is miniaturized to fit portable devices, then the device size is reduced, but image shaking increases during photography
Solution Approach 1:
The patent replaces traditional mechanical shock absorption mechanisms with an electromagnetic suspension system. OIS coils generate electromagnetic forces to levitate and stabilize the lens assembly, eliminating the need for complex mechanical damping structures. This allows miniaturization while maintaining image stability during handheld photography.
Solution Approach 2:
The patent changes the stabilization approach from passive mechanical damping to active electromagnetic control. By using sensors to detect shaking and OIS coils to generate compensating forces, the system dynamically adjusts lens position parameters to counteract vibration, enabling small form factor with effective shake correction.
2Measurement precision
If higher magnification is used in the camera, then image detail is improved, but the degree of shaking increases
Solution Approach 1:
The patent uses electromagnetic suspension instead of mechanical stabilization to counteract shaking at high magnification. The OIS coils provide precise, responsive force control that mechanically-damped systems cannot achieve, allowing the lens to remain stable even when capturing detailed high-magnification images that amplify hand movement.
Solution Approach 2:
The patent implements a feedback control system where sensors detect lens assembly movement and the control unit adjusts OIS coil currents accordingly. This closed-loop system continuously compensates for shaking, enabling high magnification photography with minimal vibration impact on image quality.
3Stability of the object's composition
If optical image stabilization is implemented by moving the lens or sensor, then shake correction is achieved, but device complexity increases
Solution Approach 1:
The patent merges the OIS carrier that holds both the lens assembly and image sensor into a single integrated unit. This unified structure tilts together as one component, reducing the number of separate moving parts and simplifying the overall mechanism while maintaining effective shake correction through electromagnetic actuation.
Solution Approach 2:
The patent replaces complex mechanical linkages and guide structures with electromagnetic suspension. The OIS coils directly actuate the integrated OIS carrier, eliminating the need for traditional mechanical transmission components and reducing structural complexity while achieving effective optical image stabilization.
4Measurement precision
If the lens and image sensor are tilted for shake correction, then image quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs self-aligning features in the OIS carrier design, including guide portions that automatically position the lens assembly and image sensor during assembly. The electromagnetic suspension system also provides self-centering forces that maintain proper alignment during operation, reducing the need for高精度 manual adjustment and simplifying manufacturing requirements.
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 design effectively reduces image shaking by allowing the lens and image sensor to tilt, improving image quality and reducing manufacturing complexity while maintaining reliability and performance consistency.
Implementation Method 1
a first OIS coil disposed to a first side of the OIS carrier, a second OIS coil disposed to a second side of the OIS carrier different with the first side, a first OIS magnet disposed to face the first OIS coil, a second OIS magnet disposed to face the second OIS coil
Data Source
AI summary
A camera module according an embodiment includes: a lens assembly, an image sensor, an optical image stabilization (OIS) carrier configured to simultaneously rotate the lens assembly and the image sensor based on an axis perpendicular to an optical axis, a housing, a first OIS coil disposed to a first side surface of the OIS carrier, a second OIS coil disposed to a second side surface of the OIS carrier, a first OIS magnet disposed to face the first OIS coil, a second OIS magnet disposed to face the second OIS coil, a frame including a first portion disposed between the third side surface of the OIS carrier opposite the first side surface and the housing and including at least one first guide portion, and a second portion extending from the first portion and disposed between the fourth side surface of the OIS carrier opposite the second side surface and the housing, at least one first object disposed between the first portion and the third side surface, and at least one second object disposed between the second portion and the housing. The at least one first object may be configured to roll along the at least one first guide portion based on the OIS carrier rotating.