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Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging

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Published on: April 11, 2025

Biomimetic variable-focus lens system controlled by winding-type SMA actuator.

Jong-Moon Choi¹, Hyung-Min Son, Yun-Jung Lee

¹School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu, Korea.

|May 13, 2009

Summary

This study introduces a novel variable-focus lens inspired by the human eye. Utilizing a shape memory alloy actuator and a gel-based PDMS lens, it achieves tunable focus insensitive to gravity and vibration.

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Area of Science:

Biomedical Engineering
Materials Science
Optics

Background:

The human eye's natural lens, ciliary muscles, and zonular fibers provide a model for advanced optical systems.
Existing tunable-focus lenses often suffer from limitations like gravity sensitivity and external vibration susceptibility.
The need for robust, adaptable optical components in various applications drives innovation in lens design.

Purpose of the Study:

To design and validate a novel variable-focus lens system inspired by human eye biomechanics.
To develop a lens system utilizing a gel-type polydimethylsiloxane (PDMS) material for enhanced stability.
To demonstrate the feasibility of a shape memory alloy (SMA) actuator for precise focal length adjustment.

Main Methods:

A variable-focus lens system was engineered, comprising a PDMS lens, a winding-type SMA actuator, and load arms.
The PDMS lens was integrated with load arms connected to an outer ring, manipulated by the SMA actuator.
Rotational movement of the outer ring by the SMA actuator induced stretching of the PDMS lens, altering its focal length.

Main Results:

The proposed system successfully demonstrated variable focal length control through mechanical manipulation of the PDMS lens.
The gel-type PDMS lens exhibited insensitivity to gravitational effects and external vibrations, enhancing system stability.
The lens was adaptable to both biconvex and aspheric shapes, offering design flexibility.

Conclusions:

The developed variable-focus lens system, inspired by ocular biomechanics, offers a promising solution for tunable optics.
The use of a gel-type PDMS lens and SMA actuator provides a robust and adaptable platform for focal length control.
Experimental validation confirms the system's design validity and potential for practical applications requiring stable, adjustable focus.