Electromagnetic MEMS OIS Assembly for Compact Camera Stabilization
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Solution Overview
Problem
Existing miniaturized actuators for camera systems face challenges in achieving compact size, low power consumption, and cost efficiency while maintaining high image stabilization and autofocus performance, particularly in portable devices where space and power constraints are stringent.
Innovation Solution
The electromagnetic MEMS optical image stabilization camera module integrates a lens barrel assembly, an IR+magnet holder subassembly, a CIS+OIS subassembly, and an RFPCB subassembly, featuring a metal spring assembly with reinforcing ribs/folds for enhanced rigidity, OIS coils, and MEMS springs for planar motion, enabling efficient image stabilization and autofocus within a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional actuators are used for image stabilization, then image stabilization performance can be achieved, but the device size and power consumption increase
Solution Approach 1:
The patent replaces conventional mechanical actuators with electromagnetic actuators that utilize electromagnetic fields to achieve image stabilization. The electromagnetic actuator includes a movable core, stationary core, and coil assembly that generates electromagnetic force to move the image sensor, eliminating the need for bulky mechanical components while maintaining stabilization performance
Solution Approach 2:
The patent changes the operating parameters by using electromagnetic force generation through controlled current in the coil assembly, rather than mechanical actuation. This allows for precise control of the image sensor position with smaller, more power-efficient components compared to conventional mechanical systems
2Reliability
If conventional actuators are used for image stabilization, then image stabilization performance can be achieved, but power consumption increases
Solution Approach 1:
The electromagnetic actuator system replaces energy-intensive mechanical actuators with an electromagnetic field-based system. The coil assembly generates electromagnetic force only when needed for stabilization corrections, consuming less power than continuous mechanical actuation systems while maintaining image stabilization performance
Solution Approach 2:
The electromagnetic actuator operates periodically based on detected image motion, activating the coil assembly only when stabilization correction is needed. This periodic electromagnetic actuation reduces average power consumption compared to conventional systems that may require continuous mechanical operation
3Volume of moving object
If miniaturized actuators are used, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the image sensor, electromagnetic actuator components (movable core, stationary core, coil assembly), and support structure into an integrated assembly. The movable core is coupled to the image sensor, and the entire assembly is mounted on the support structure with the coil assembly positioned to surround the movable core, simplifying manufacturing compared to assembling separate miniaturized components
Solution Approach 2:
The support structure serves multiple functions: it mechanically supports the image sensor assembly, provides mounting for the coil assembly, and facilitates the electromagnetic actuation mechanism. This multi-functionality reduces the number of separate components needed, thereby reducing manufacturing complexity despite the miniaturized design
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 allows for improved image quality and stability by effectively counteracting camera shake and movement, reducing blur, and enabling sharper images and smoother videos in challenging conditions, while maintaining a compact and power-efficient design suitable for portable devices.
Implementation Method 1
one or more OIS coils configured to enable planar movement of the metal spring assembly
Implementation Method 2
one or more magnet assemblies
Data Source
AI summary
An electromagnetic MEMS optical image stabilization camera module includes: a lens barrel assembly; an IR+magnet holder subassembly, wherein the IR+magnet holder subassembly includes: one or more magnet assemblies; a CIS+OIS subassembly, wherein the CIS+OIS subassembly includes: a camera image sensor; a metal spring assembly configured to enable planar motion of the camera image sensor, and one or more OIS coils configured to enable planar movement of the metal spring assembly; and an RFPCB subassembly.