Image Sensor Actuator Layout for Precise Optical Stabilization
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Solution Overview
Problem
The increasing weight of lens modules in camera modules complicates precise control of driving force for optical image stabilization, making it difficult to achieve accurate image stabilization and focus adjustment.
Innovation Solution
An actuator system with a fixed frame, movable frame, and a first driving unit comprising coils and magnets, along with a sensor substrate and wiring pattern, allows for precise movement of the image sensor to compensate for shaking and adjust focus, using a ball member for support and damping, and coils for generating driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens module weight is increased to improve camera performance, then image quality is improved, but the driving force control precision for optical image stabilization deteriorates
Solution Approach 1:
Instead of moving the heavy lens module for optical image stabilization, the patent inverts the approach by moving the lighter image sensor in the opposite direction to compensate for shaking. This reduces the driving force requirements and improves control precision while maintaining stabilization effectiveness.
Solution Approach 2:
The camera module is divided into separate movable components: the lens module remains relatively fixed while the image sensor is mounted on a movable frame that can be independently actuated. This segmentation allows the lighter image sensor to be moved for stabilization rather than moving the entire heavy lens assembly.
2Manufacturing precision
If the lens module weight is increased to improve camera performance, then image quality is improved, but the ease of operation for focus adjustment deteriorates
Solution Approach 1:
Instead of adjusting focus by moving the heavy lens module, the patent moves the lighter image sensor toward or away from the lens to achieve focus adjustment. This inversion reduces the actuation force required and improves ease of operation while maintaining focus capability.
3Force
If the image sensor is moved for optical image stabilization instead of the lens module, then the driving force requirement is reduced, but the wiring complexity increases
Solution Approach 1:
The patent employs a flexible wiring pattern formed as a thin film on the movable frame, allowing electrical connections to the image sensor while accommodating its movement. This flexible wiring solution reduces driving force requirements for stabilization without excessively increasing wiring complexity.
Solution Approach 2:
The movable frame acts as an intermediary structure that integrates both the image sensor and its wiring. This intermediary platform simplifies the overall wiring architecture by consolidating connections rather than requiring separate wiring paths for each component.
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 system enables improved optical image stabilization and focus adjustment with reduced driving force requirements, allowing for more accurate image capture by moving the image sensor rather than the lens module.
Implementation Method 1
a first driving unit including a plurality of coils disposed on one of the fixed frame and the movable frame and a plurality of magnets disposed on the other
Implementation Method 2
a first ball member disposed between the fixed frame and the movable frame, wherein any one of the fixed frame and the movable frame may include a first frame in which the plurality of coils are disposed and a second frame in which the first ball member is disposed
Data Source
AI summary
An actuator for optical image stabilization includes a fixed frame having an internal space, a movable frame accommodated in the fixed frame and movable relative to the fixed frame, a first driving unit including a plurality of coils disposed on one of the fixed frame and the movable frame and a plurality of magnets disposed on the other, and a sensor substrate including a moving portion coupled to the movable frame, wherein a wiring pattern is disposed inside one of the fixed frame and the movable frame, and the plurality of coils and the sensor substrate are electrically connected by the wiring pattern.