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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Published on: February 4, 2018

Variable-focus lens with 1-kHz bandwidth.

Hiromasa Oku, Koichi Hashimoto, Masatoshi Ishikawa

|May 29, 2009

Summary

This summary is machine-generated.

This study introduces a novel variable-focus lens capable of 1-kHz bandwidth, utilizing liquid pressure from a piezo stack actuator and a motion amplifier. Prototypes achieved high bandwidth and adjustable refractive power, demonstrating potential for advanced optical systems.

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Area of Science:

Optics and Photonics
Mechanical Engineering
Materials Science

Background:

Traditional lenses have fixed focal lengths, limiting dynamic focusing capabilities.
Piezoelectric actuators offer precise but limited displacement, hindering rapid optical adjustments.

Purpose of the Study:

To develop a variable-focus lens with a high bandwidth (1 kHz).
To enhance the performance of piezoelectric actuators for optical applications.
To validate the design through prototype development and testing.

Main Methods:

Utilized liquid pressure generated by a piezo stack actuator to rapidly change lens shape.
Integrated a high-bandwidth motion amplifier to overcome the limited working range of the piezo actuator.
Fabricated and tested prototype lenses to measure frequency response and optical performance.

Main Results:

Achieved a confirmed 1-kHz bandwidth for the variable-focus lenses.
Demonstrated a tunable refractive power range from -1/167 to 1/129 mm⁻¹.
Attained a maximum optical resolution of 12.3 cycles/mm.

Conclusions:

The proposed design successfully enables high-speed, variable focusing.
The integrated motion amplifier effectively compensates for piezo actuator limitations.
The developed lenses show promise for applications requiring rapid optical adjustments.