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Paper Abstract and Keywords
Presentation 2023-02-28 16:10
Frequency characteristics of ultrasonic variable focus liquid crystal lenses
Yuma Kuroda, Yuki Harada (Doshisha Univ.), Akira Emoto (Tokushima Univ.), Mami Matsukawa, Daisuke Koyama (Doshisha Univ.) US2022-81
Abstract (in Japanese) (See Japanese page) 
(in English) General optical solid lenses only have one focus point, and compound lens systems that have multiple lenses and mechanical actuators are used in lens modules to focus objects at near to far distances although the camera modules with these systems tend to be bulky and have a low time response. Electrically-controllable varifocal lenses will accelerate the development of compact-size photographic devices with a high-speed response. We developed ultrasound varifocal liquid crystal lenses, that consist of a liquid crystal layer between two glass discs and an ultrasound transducer, where the orientation of nematic liquid crystal molecules can be controlled by the acoustic radiation force. The lenses can change the refractive index distribution and its focal length by ultrasound vibration by utilizing both high liquidity and optical anisotropy of the nematic liquid crystal molecules. In this report, an ultrasound varifocal lens was fabricated and driven at its mechanical resonant frequencies, and the frequency characteristics of the lens were evaluated. The experimental results revealed that the changes in the focal length were largely dependent on the vibrational displacement. The fact that the effective lens apertures changed with the wavelength of the resonant flexural vibration implies that the effective apertures can be controlled by the driving frequency.
Keyword (in Japanese) (See Japanese page) 
(in English) Ultrasound / Variable Focus Optical Lens / Liquid Crystal / Flexural Vibration / Acoustic Radiation Force / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 391, US2022-81, pp. 28-33, Feb. 2023.
Paper # US2022-81 
Date of Issue 2023-02-21 (US) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF US2022-81

Conference Information
Committee US  
Conference Date 2023-02-28 - 2023-02-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Kindai University (Higashi-osaka) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustic imaging, NDT, Ultrasound in medicine, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2023-02-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Frequency characteristics of ultrasonic variable focus liquid crystal lenses 
Sub Title (in English)  
Keyword(1) Ultrasound  
Keyword(2) Variable Focus Optical Lens  
Keyword(3) Liquid Crystal  
Keyword(4) Flexural Vibration  
Keyword(5) Acoustic Radiation Force  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yuma Kuroda  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Yuki Harada  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Akira Emoto  
3rd Author's Affiliation Tokushima University (Tokushima Univ.)
4th Author's Name Mami Matsukawa  
4th Author's Affiliation Doshisha University (Doshisha Univ.)
5th Author's Name Daisuke Koyama  
5th Author's Affiliation Doshisha University (Doshisha Univ.)
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Speaker Author-1 
Date Time 2023-02-28 16:10:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2022-81 
Volume (vol) vol.122 
Number (no) no.391 
Page pp.28-33 
#Pages 6 
Date of Issue 2023-02-21 (US) 

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