Camera Actuator Layout for Precise OIS During Focus Movement
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Solution Overview
Problem
Existing camera actuators face challenges in precisely controlling the driving force for optical image stabilization due to changes in the relative position of camera shake compensation magnets and coils during focus adjustment, affecting the accuracy of image stabilization.
Innovation Solution
The actuator design includes a housing with a guide member, base, and carrier stacked in the optical axis direction, featuring a first driving unit with multiple magnets and coils for perpendicular movement and a second driving unit with a magnet and coil for axial movement, utilizing ball members and guide grooves for precise movement and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens module is moved in the optical axis direction during focus adjustment, then the focus can be adjusted, but the relative position of the camera shake compensation magnet and coil changes, making it difficult to precisely control the driving force for optical image stabilization
Solution Approach 1:
The actuator is divided into two independent driving units: a first driving unit for optical image stabilization (moving the lens module in directions perpendicular to the optical axis) and a second driving unit for focus adjustment (moving the lens module in the optical axis direction). This segmentation allows each unit to operate independently, so focus adjustment does not affect the relative position of the camera shake compensation magnet and coil, thereby maintaining precise control of the driving force for optical image stabilization.
2Reliability
If a magnet for optical image stabilization is mounted on the lens module, then camera shake can be corrected, but the relative position change during focus adjustment affects the precision of driving force control
Solution Approach 1:
The actuator is divided into two independent driving units: a first driving unit for optical image stabilization (moving the lens module in directions perpendicular to the optical axis) and a second driving unit for focus adjustment (moving the lens module in the optical axis direction). This segmentation allows each unit to operate independently, so focus adjustment does not affect the relative position of the camera shake compensation magnet and coil, thereby maintaining precise control of the driving force for optical image stabilization.
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 configuration enables precise control of driving forces for both focus adjustment and optical image stabilization, improving the accuracy and efficiency of camera shake compensation.
Implementation Method 1
a second driving unit configured to generate driving force in the optical axis direction and including a magnet and a coil
Implementation Method 2
a first driving unit configured to generate driving force in a first axial direction, perpendicular to the optical axis direction, and in a second axial direction, perpendicular to both the optical axis direction and the first axial direction, the first driving unit including a plurality of magnets and a plurality of coils
Data Source
AI summary
An actuator for a camera includes a guide member, a base, and a carrier stacked in a housing in an optical axis direction, a first driving unit generating driving force in a first axial direction and a second axial direction, the first driving unit including a plurality of magnets and a plurality of coils, and a second driving unit generating driving force in the optical axis direction and including a magnet and a coil. The carrier, the base, and the guide member are movable together in the first axial direction, the carrier and the base are movable together in the second axial direction, the carrier is movable relative to the base in the optical axis direction, the magnets and the coils of the first driving unit and the magnet and the coil of the second driving unit are disposed to face each other in the optical axis direction.