Flexible zoom lens module with polyhedral cylindrical linear ultrasonic motor-actuated transparent elastomer

Area of Science:

• Optics and Photonics
• Materials Science
• Mechanical Engineering

Background:

• Traditional zoom lenses are bulky due to multiple solid elements and electromagnetic drivers.
• Miniaturization is crucial for compact optical systems, but current zoom lens designs present limitations.
• Existing zoom lens technologies struggle to meet the demands of space-constrained applications.

Purpose of the Study:

• To present a novel flexible zoom lens module for miniaturized optical systems.
• To develop a zoom lens driven by a cylindrical ultrasonic motor (CYUSM) for precise focal length control.
• To overcome the size and complexity limitations of conventional zoom lenses.

Main Methods:

• A flexible zoom lens module driven by a CYUSM, utilizing a transparent elastomeric lens made of Polydimethylsiloxane (PDMS).
• Optimization of CYUSM stator and PDMS lens parameters using ANSYS finite element analysis for modal frequency degeneracy and electromechanical coupling.
• Experimental characterization of the CYUSM actuator and optical performance evaluation using ZEMAX.

Main Results:

• The CYUSM achieved a maximum velocity of 1.21 mm/s and a thrust force of 5.4 N.
• The flexible zoom lens module demonstrated a minimum focal length of 36.5 mm.
• Experimental results closely matched simulation predictions, validating the design's accuracy.

Conclusions:

• The developed flexible zoom lens module offers high integration and miniaturization through a coaxial hollow structure.
• The CYUSM-driven design provides self-locking and electromagnetic interference immunity.
• This technology enables continuous focal length adjustment for compact optical systems.