Dielectric Elastomer Actuator for Compact Lens Positioning
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Solution Overview
Problem
The challenge in developing compact camera modules for portable electronic devices is to create smaller, cost-effective imaging modules with reduced manufacturing tolerances while maintaining image stabilization and autofocus capabilities.
Innovation Solution
An imaging module incorporating an electromagnetic actuator with a magnet and coil configuration that allows for precise movement and rotation of the lens assembly relative to the image sensor, enabling both autofocus and image stabilization functions, and utilizing a spring mechanism for return to a neutral position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional lens moving mechanisms are used, then manufacturing precision can be maintained, but the imaging module size and complexity increase
Solution Approach 1:
The patent replaces traditional mechanical lens moving mechanisms (such as voice coil motors, piezoelectric actuators, or electromagnetic actuators with complex coil-winding structures) with a dielectric elastomer actuator that utilizes electrostatic field-induced deformation. This substitution eliminates complex mechanical components, reduces the overall imaging module size, and simplifies the structure while maintaining precise lens position control for both autofocus and image stabilization functions
Solution Approach 2:
The patent changes the actuation parameter from mechanical force or electromagnetic induction to electrostatic field strength. By applying high voltage to the dielectric elastomer, the material's physical state changes (expands or contracts), enabling compact lens movement. This parameter change allows for a smaller form factor while achieving the required precision for autofocus and image stabilization
2Volume of moving object
If compact design is pursued, then form factor is reduced, but manufacturing tolerances become more difficult to control
Solution Approach 1:
By replacing mechanical actuation systems with a dielectric elastomer-based electrostatic actuator, the patent eliminates the need for precisely machined mechanical interfaces, gear trains, and coil windings. The elastomer's uniform deformation characteristics and the simplicity of the electrode structure significantly reduce manufacturing tolerance requirements, enabling compact design without sacrificing manufacturing feasibility
Solution Approach 2:
The patent employs composite material structures, particularly the dielectric elastomer layer combined with flexible electrodes and support layers. These composite materials provide both structural integrity and actuation functionality in a single integrated component, reducing the number of assembly steps and tolerance accumulation, thereby facilitating compact design with relaxed manufacturing tolerances
3Force
If electromagnetic actuators with complex coil structures are used, then driving force is sufficient, but device complexity and cost increase
Solution Approach 1:
The patent substitutes complex electromagnetic coil structures with a dielectric elastomer actuator that generates driving force through electrostatic pressure. This replacement eliminates the need for precise coil winding, magnetic field shaping, and complex electromagnetic circuitry, significantly reducing actuator structure complexity while maintaining sufficient driving force for lens movement in both autofocus and image stabilization modes
Solution Approach 2:
The patent changes the force generation mechanism from electromagnetic interaction to electrostatic pressure. By applying high voltage (typically several hundred to thousands of volts) across thin dielectric elastomer layers, substantial electrostatic pressure is generated, providing adequate driving force for compact lens actuation without requiring complex coil structures or large magnetic assemblies
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 solution enables the creation of compact, cost-effective imaging modules with improved autofocus and image stabilization capabilities, allowing for smaller form factors and reduced manufacturing costs while maintaining image quality.
Implementation Method 1
an electromagnetic actuator comprising a first coil, a first coil set, and a second coil set
Implementation Method 2
utilizing a spring mechanism for return to a neutral position
Data Source
AI summary
The subject matter disclosed herein relates to an imaging module comprising an electromagnetic actuator to provide focus-related and image stabilization-related functionality.