Camera Module OIS Actuator Magnetic Shielding
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Solution Overview
Problem
Inter-module interference due to magnetic flux leakage occurs in camera modules with typical actuators for optical image stabilization, affecting the performance and reliability of portable communication devices.
Innovation Solution
The camera module design includes a housing with a frame, a movable body, and two optical image stabilization (OIS) actuators positioned to minimize magnetic field leakage by orienting the OIS coils and magnets in a way that their active regions are larger than the travel distance of the actuators, with specific openings and yokes to facilitate movement while reducing magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple OIS actuators are operated in a typical camera module, then optical image stabilization function is improved, but magnetic flux leakage causes inter-module interference
Solution Approach 1:
A magnetic shielding member is introduced as an intermediary component between the OIS actuators and other components. This shielding member selectively blocks magnetic flux leakage while allowing the OIS actuators to function normally, thus resolving the interference problem without sacrificing stabilization performance
Solution Approach 2:
The harmful magnetic flux leakage is extracted and isolated from the main system by positioning the magnetic shielding member to contain and redirect the magnetic field. This separates the useful magnetic field (for OIS operation) from the harmful leakage (causing interference)
2Reliability
If OIS actuators are disposed on adjacent surfaces of the camera module, then optical image stabilization performance is improved, but interference occurs between actuators
Solution Approach 1:
The magnetic shielding member acts as a mediator between adjacent OIS actuators, blocking the magnetic flux from one actuator from reaching another. This allows multiple actuators to operate on adjacent surfaces without interfering with each other
3Adaptability or versatility
If components sensitive to magnetic field are disposed around the actuator, then camera module functionality is improved, but magnetic field interference affects component performance
Solution Approach 1:
The magnetic shielding member serves as a protective intermediary between the OIS actuator and sensitive components. It allows the camera module to maintain full functionality with various components while preventing magnetic field interference from affecting their performance
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 reduces magnetic field leakage, enhances the stability and reliability of the camera module by preventing interference with components sensitive to magnetic fields, and simplifies the assembly process without increasing the module's size.
Implementation Method 1
a first OIS coil and a first OIS magnet of the first OIS actuator are disposed to face each other... configured to move the movable body in a first direction, perpendicular to an optical axis... a second OIS coil and a second OIS magnet of the second OIS actuator are disposed to face each other... configured to move the lens holder in a second direction perpendicular to the first direction
Implementation Method 2
a first OIS ball member disposed between the frame and the movable body to facilitate movement of the movable body... a second OIS ball member disposed between the movable body and the lens holder to facilitate movement of the lens holder
Data Source
AI summary
A camera module includes a housing, a frame disposed in an interior space of the housing, a movable body, a lens holder, first and second optical image stabilization (OIS) actuators. The movable body is configured to move in a first direction, perpendicular to an optical axis. The lens holder is configured to move in a second direction perpendicular to the first direction. The first OIS actuator is configured to move the movable body in the first direction. The second OIS actuator is configured to move the lens holder in the second direction. The frame includes a first opening through which a first OIS coil and a first OIS magnet of the first OIS actuator are disposed to face each other, and a second opening through which a second OIS coil and a second OIS magnet of the second OIS actuator are disposed to face each other.