Two-Axis Camera Actuator Layout for Compact OIS Without Magnetic Interference
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Solution Overview
Problem
Existing camera devices face challenges in securing sufficient space for optical image stabilization (OIS) actuators due to spatial constraints and magnetic field interference, particularly in ultra-slim and high-resolution cameras, which limits lens size and causes image shake in low-light conditions.
Innovation Solution
A camera actuator design that includes a holder with rotation parts connected by bridges, utilizing piezoelectric parts to tilt an optical member along two axes, allowing for OIS without increasing device size and preventing magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the lens size is increased to increase light reception, then light capture ability is improved, but the device size and space requirements increase
Solution Approach 1:
The patent implements nesting by placing the OIS actuator inside the AF/zoom actuator structure. The OIS magnet assembly is positioned within the space occupied by the AF/zoom magnet, allowing both functions to share the same spatial envelope. This nested configuration enables the lens to achieve adequate size for light capture while keeping the overall device volume constrained.
2Reliability
If the actuator for OIS is disposed around the lens, then OIS function is achieved, but magnetic field interference with AF or zoom magnet occurs
Solution Approach 1:
The patent extracts the OIS magnet from the traditional radial arrangement around the lens and repositions it axially within the AF/zoom actuator structure. By taking out the OIS magnet and placing it in the axial direction, the design eliminates the magnetic field interference that would occur with radial placement while maintaining effective OIS functionality.
Solution Approach 2:
The patent transitions the OIS magnet arrangement from a radial configuration (in the plane perpendicular to the optical axis) to an axial configuration (along the optical axis direction). This dimensional change allows the OIS magnet to be positioned without interfering with the AF/zoom magnet's magnetic field, as the two actuate in different spatial dimensions.
3Reliability
If the lens or camera module is tilted or moved for OIS, then image stabilization is achieved, but additional space for tilting or moving is required
Solution Approach 1:
The patent implements nesting by integrating the OIS tilting mechanism within the existing AF/zoom actuator structure. The OIS rotation plate and bridge mechanism are positioned inside the space already allocated for AF/zoom operations, allowing the lens to tilt for stabilization without requiring additional external space.
Data Source
AI summary
A camera actuator may include a holder disposed on a lower portion, a rotation part disposed in the holder, an optical member disposed on the rotation part, and a first driving part configured to tilt the optical member along a first axis and a second driving part configured to tilt the optical member along a second axis by pressing the rotation part. Further, the rotation part may include a first rotation plate disposed therein. Additionally, the first driving part may include a first operating part configured to contact the first rotation plate, and a first suction part disposed adjacent to the first rotation plate and configured to pull the first rotation plate.