TY - GEN
T1 - Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change
AU - Fukui, Tsugumi
AU - Shimizu, Sota
AU - Muryobayashi, Keigo
AU - Kawamura, Marenori
AU - Sato, Susumu
AU - Hasebe, Nobuyuki
N1 - Funding Information:
This study was partially supported by JSPS Grants-in-Aid for Scientific Research No.18K04055 and No.21K03983.
Publisher Copyright:
© 2021 IEEE.
PY - 2021/10/13
Y1 - 2021/10/13
N2 - A liquid crystal (LC) lens can make any lens state from positive (convex) to negative (concave) by applying an external voltage. However, when the LC lens changes its focal length, it is difficult to say its response time is fast enough. In this paper, the authors aim at making the response time of the LC lens be shorter by using a control theory to a value of the external voltage applied to the LC lens. We constructed an automatic control system which can change the focal length faster by a computer program. The computer program gives appropriate effective values of AC voltages with the LC lens based on a feed forward control. We conducted experiments to change the focal length of the LC lens from a non-lens state to 200mm and-100mm, respectively. When our proposed effective voltage control method was performed, the response time was successfully reduced in half, compared to a case when a simple step-like voltage was applied.
AB - A liquid crystal (LC) lens can make any lens state from positive (convex) to negative (concave) by applying an external voltage. However, when the LC lens changes its focal length, it is difficult to say its response time is fast enough. In this paper, the authors aim at making the response time of the LC lens be shorter by using a control theory to a value of the external voltage applied to the LC lens. We constructed an automatic control system which can change the focal length faster by a computer program. The computer program gives appropriate effective values of AC voltages with the LC lens based on a feed forward control. We conducted experiments to change the focal length of the LC lens from a non-lens state to 200mm and-100mm, respectively. When our proposed effective voltage control method was performed, the response time was successfully reduced in half, compared to a case when a simple step-like voltage was applied.
KW - effective voltage control
KW - liquid crystal lens
KW - rapid focal length change
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U2 - 10.1109/IECON48115.2021.9589764
DO - 10.1109/IECON48115.2021.9589764
M3 - Conference contribution
AN - SCOPUS:85119503395
T3 - IECON Proceedings (Industrial Electronics Conference)
BT - IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society
PB - IEEE Computer Society
T2 - 47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021
Y2 - 13 October 2021 through 16 October 2021
ER -