Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change

Tsugumi Fukui; Sota Shimizu; Keigo Muryobayashi; Marenori Kawamura; Susumu Sato; Nobuyuki Hasebe

doi:10.1109/IECON48115.2021.9589764

Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change

Tsugumi Fukui, Sota Shimizu, Keigo Muryobayashi, Marenori Kawamura, Susumu Sato, Nobuyuki Hasebe

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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.

Original language	English
Title of host publication	IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society
Publisher	IEEE Computer Society
ISBN (Electronic)	9781665435543
DOIs	https://doi.org/10.1109/IECON48115.2021.9589764
Publication status	Published - 2021 Oct 13
Event	47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021 - Toronto, Canada Duration: 2021 Oct 13 → 2021 Oct 16

Publication series

Name	IECON Proceedings (Industrial Electronics Conference)
Volume	2021-October

Conference

Conference	47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021
Country/Territory	Canada
City	Toronto
Period	21/10/13 → 21/10/16

Keywords

effective voltage control
liquid crystal lens
rapid focal length change

ASJC Scopus subject areas

Control and Systems Engineering
Electrical and Electronic Engineering

Access to Document

10.1109/IECON48115.2021.9589764

Cite this

Fukui, T., Shimizu, S., Muryobayashi, K., Kawamura, M., Sato, S., & Hasebe, N. (2021). Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change. In IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society (IECON Proceedings (Industrial Electronics Conference); Vol. 2021-October). IEEE Computer Society. https://doi.org/10.1109/IECON48115.2021.9589764

Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change. / Fukui, Tsugumi; Shimizu, Sota; Muryobayashi, Keigo et al.

IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society. IEEE Computer Society, 2021. (IECON Proceedings (Industrial Electronics Conference); Vol. 2021-October).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Fukui, T, Shimizu, S, Muryobayashi, K, Kawamura, M, Sato, S & Hasebe, N 2021, Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change. in IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society. IECON Proceedings (Industrial Electronics Conference), vol. 2021-October, IEEE Computer Society, 47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021, Toronto, Canada, 21/10/13. https://doi.org/10.1109/IECON48115.2021.9589764

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abstract = "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.",

keywords = "effective voltage control, liquid crystal lens, rapid focal length change",

author = "Tsugumi Fukui and Sota Shimizu and Keigo Muryobayashi and Marenori Kawamura and Susumu Sato and Nobuyuki Hasebe",

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AU - Sato, Susumu

AU - Hasebe, Nobuyuki

PY - 2021/10/13

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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.

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Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change

Abstract

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Keywords

ASJC Scopus subject areas

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