Camera Actuator With Magnetic Prism Support for Slim OIS
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Solution Overview
Problem
Existing camera modules face challenges in achieving slimness, securing sufficient light, minimizing lens size limitations, and preventing magnetic interference while implementing optical image stabilization (OIS), with issues such as decenter and tilt phenomena during OIS.
Innovation Solution
A camera actuator design incorporating a housing, prism unit, and driving unit with ball bearings and pulling magnets, where the prism unit is supported by attractive forces, allowing for tilting in multiple axes with reduced size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional OIS mechanism is used, then image stabilization is achieved, but the camera module thickness increases
Solution Approach 1:
The patent replaces the conventional mechanical OIS mechanism with a magnetic field-based system. A magnet is positioned on the prism mover, and a magnetic sensor detects changes in magnetic flux as the prism moves. This allows OIS functionality to be achieved through magnetic field interaction rather than direct mechanical coupling, significantly reducing the required thickness of the camera module while maintaining image stabilization capability.
2Illumination intensity
If lens size is increased to secure sufficient light, then light reception is improved, but the camera module size increases
Solution Approach 1:
The patent optimizes the optical path efficiency by precisely controlling the light transmission path through the prism and lens assembly. By improving the angular distribution and coupling efficiency of light between the objective lens and image sensor, the system achieves better light reception performance without increasing lens aperture size, thus maintaining compact camera module dimensions.
3Device complexity
If magnetic field is used for OIS, then structural complexity is reduced, but magnetic interference with AF/Zoom magnets occurs
Solution Approach 1:
The patent introduces a magnetic sensor as an intermediary between the magnet on the prism mover and the control system. The magnetic sensor detects magnetic flux changes and converts them into electrical signals, enabling indirect measurement of prism position and movement. This intermediary approach allows the system to achieve precise control while minimizing direct magnetic interference with other components, as the magnetic field interaction is localized and measured rather than directly coupled.
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 achieves an ultra-thin and ultra-small camera actuator with minimal decenter or tilt phenomena, securing sufficient light, and reducing part count and power consumption.
Implementation Method 1
a ball bearing and a pulling magnet for generating attractive force to each other are disposed in the prism unit and the housing, and wherein the prism unit is supported to the housing by the attractive force between the ball bearing and the pulling magnet
Data Source
AI summary
A camera actuator includes a housing; a prism unit disposed in the housing; and a driving unit for tilting the prism unit. A ball bearing and a pulling magnet for generating attractive force to each other are disposed in the prism unit and the housing. The prism unit is supported to the housing by the attractive force between the ball bearing and the pulling magnet.