Tunable Microlens Array for Compact Optical Imaging
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Solution Overview
Problem
Current microscopic optical systems are bulky, expensive, and require complex mechanical and electronic control systems, which do not scale well to the microscale and consume significant power, limiting their miniaturization and efficiency in optical imaging and microscopy applications.
Innovation Solution
An artificial compound eye with a plurality of variable focus optical microlenses that are autonomously tuned by local environmental parameters, using hydrogel actuators responsive to stimuli such as temperature, allowing for compact, scalable, and cost-effective optical imaging systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional mechanical lens displacement methods are used to achieve variable focus, then focal length tuning is possible, but the system becomes bulky and requires complicated mechanical components
Solution Approach 1:
The patent replaces mechanical lens displacement systems with a tunable microlens that adjusts focal length through changes in the refractive index of the lens material. This is achieved using electrowetting technology where electrical signals control the refractive index, eliminating the need for mechanical moving parts while maintaining variable focus capability.
Solution Approach 2:
The patent changes the refractive index parameter of the microlens material dynamically to achieve focal length tuning. By applying electrical signals that alter the refractive index of the lens material, the system achieves variable focus without mechanical displacement, reducing device complexity.
2Device complexity
If electrowetting-based tunable microlenses are used to simplify lens tuning, then mechanical complexity is reduced, but electronic control systems remain complicated and consume excessive power
Solution Approach 1:
The patent implements a self-aligned microlens array where each microlens is independently tunable through simple electrical signals. The system uses self-aligned fabrication processes that eliminate complex assembly and control mechanisms, reducing power consumption while maintaining simplified mechanical structure.
Solution Approach 2:
The patent divides the optical system into multiple independent microlenses arranged in an array, where each element can be tuned independently with minimal control signal. This segmentation allows simple electronic control for each lens element, reducing overall system complexity and power consumption compared to a single complex tunable lens.
3Measurement precision
If camera-eye design with single aperture lens is used, then high sensitivity and resolution are achieved, but field of view is limited requiring complex mechanical control
Solution Approach 1:
The patent uses an array of multiple microlenses instead of a single lens, with each microlens capturing a portion of the visual field. This segmented approach provides a wide field of view while maintaining resolution through the collective array, eliminating the need for mechanical movement to expand viewing angle.
Solution Approach 2:
The patent transitions from a single-aperture camera-eye design to a multi-aperture compound eye structure, adding spatial dimensionality to the optical system. This allows simultaneous capture of multiple viewing angles across the array, providing wide field of view without requiring mechanical rotation or movement.
4Adaptability or versatility
If compound eye with multiple lens elements is used to achieve wide field of vision, then field of view is improved, but alignment of multiple layers during assembly becomes difficult
Solution Approach 1:
The patent fabricates each microlens as an independent element in an array, with each lens self-aligned to its position. This segmented fabrication approach eliminates the need for complex multi-layer alignment during assembly, as each lens element is independently positioned and tuned.
Solution Approach 2:
The patent employs self-aligned fabrication processes where the microlens array structure inherently positions each lens element correctly without requiring external alignment tools or complex assembly procedures. The design enables automatic positioning and tuning of each lens, simplifying manufacturing.
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 solution enables the creation of compact, cost-effective, and easily fabricated optical imaging systems with adjustable focal lengths, reducing the need for complex mechanical and electronic controls, and providing a wide field of view without sacrificing resolution or sensitivity.
Implementation Method 1
Each actuator includes a hydrogel. The hydrogel has a configuration responsive to a predetermined stimulus. The hydrogel is movable between a first configuration wherein the lens has a first focal length and a second configuration wherein the lens has a second focal length in response to a predetermined stimulus.
Data Source
AI summary
A compound eye is provided. The compound eye includes a microfluidic device defining a plurality of wells therein. A plurality of lenses are disposed in corresponding wells of the microfluidic device. Each lens has a tunable focal length. A tuning structure tunes the focal length of each lens in response to a predetermined stimulus.