Electroactive Polymer Lens Actuation for Compact Camera Systems
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Solution Overview
Problem
Conventional optical lens systems for digital cameras and camera phones have high power consumption, large form factor, and increased manufacturing costs due to the need for numerous mechanical components for auto-focusing, zoom, and image stabilization, which also suffer from camera shake issues.
Innovation Solution
Integration of electroactive polymer (EAP) actuators to adjust lens parameters such as focal length, magnification, and image stabilization, minimizing mechanical components and leveraging EAP transducers to control aperture and shutter mechanisms for reduced complexity and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mechanical systems (motors, solenoids, gears, cams) are used to adjust optical elements for auto-focusing, zoom, and image stabilization, then these functions can be achieved, but power consumption is high, response times are long, accuracy is limited, and space requirements are high
Solution Approach 1:
The patent replaces conventional mechanical actuators (motors, solenoids, voice coils) with electroactive polymer (EAP) actuators that use electrochemical actuation instead of electromagnetic or mechanical mechanisms. The EAP actuators convert electrical signals directly into mechanical displacement through electrochemical reactions, eliminating the need for complex mechanical transmission systems and reducing power consumption while improving response time and accuracy
Solution Approach 2:
The patent changes the actuation mechanism from electromagnetic field-based (voice coils) to electrochemical field-based (EAP actuators). This parameter change in the physical principle enables more efficient energy conversion, lower power consumption, and reduced mass while maintaining or improving the precision and speed of optical element adjustment
2Adaptability or versatility
If conventional mechanical systems with numerous moving parts are used to provide auto-focusing, zoom, and image stabilization, then these functions are achieved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent replaces complex mechanical transmission systems (gears, cams, linkages) with direct-acting electroactive polymer actuators. Each EAP actuator directly positions an optical element without requiring mechanical intermediaries, dramatically reducing the number of moving parts and simplifying the overall system architecture while maintaining full functionality for auto-focusing, zoom, and image stabilization
Solution Approach 2:
The patent employs EAP actuators that can perform multiple functions (auto-focusing, zoom, image stabilization) using the same fundamental actuation mechanism. This multi-functionality reduces device complexity compared to conventional systems that require separate mechanical systems for each function, as the EAP technology provides a unified approach to all optical element positioning tasks
3Adaptability or versatility
If conventional mechanical systems are used for lens adjustment, then focusing and zoom capabilities are achieved, but response times are long and accuracy is limited
Solution Approach 1:
The patent replaces electromagnetic actuators (voice coils) with electroactive polymer actuators that utilize electrochemical actuation. This substitution enables faster response times because EAP actuators can rapidly respond to voltage changes through electrochemical reactions, and they provide superior positioning accuracy due to the precise control of electrochemical processes, eliminating the inertia and lag associated with electromagnetic and mechanical systems
4Weight of moving object
If voice coil technology is used to reduce camera mass, then smaller and lighter optical lens systems are achieved, but camera shake has greater effect on photograph quality
Solution Approach 1:
The patent replaces voice coil actuators with electroactive polymer actuators, maintaining the lightweight advantage while improving image stabilization performance. The EAP actuators provide superior control precision and responsiveness for counteracting camera shake, and their electrochemical actuation mechanism offers better damping characteristics that enhance image quality under vibrational conditions compared to electromagnetic voice coil systems
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 EAP actuator-based optical lens systems achieve compact form factors, reduced power consumption, and lower manufacturing costs while effectively addressing camera shake and providing auto-focusing, zoom, and image stabilization capabilities.
Implementation Method 1
employing electroactive polymer transducers to adjust the lens to provide auto-focusing, zoom, image stabilization and/or shutter/aperture capabilities
Data Source
AI summary
The present invention provides optical systems, devices and methods which utilize one or more electroactive polymer actuators to adjust an optical parameter of the optical device or system.