Small form-factor VGA camera with variable focus by liquid lens
We present the design of a 24 mm long variable focus lens for 1/4" sensor. The chosen CMOS color sensor has VGA (640×480) resolution and 5.6 μm pixel size. The lens utilizes one Varioptic Arctic 320 liquid lens that has a voltage-controllable focal length due to the electrowetting effect. There...
Published in: | SPIE Proceedings, Optics, Photonics, and Digital Technologies for Multimedia Applications |
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International Society for Optics and Photonics SPIE
2010
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Online Access: | https://cris.vtt.fi/en/publications/5bc3312a-fe6b-410b-b1f7-8aa2b8a22c41 https://doi.org/10.1117/12.851142 |
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ftvttcrispub:oai:cris.vtt.fi:publications/5bc3312a-fe6b-410b-b1f7-8aa2b8a22c41 2023-05-15T15:09:06+02:00 Small form-factor VGA camera with variable focus by liquid lens Oikarinen, Kari Aikio, Mika 2010 https://cris.vtt.fi/en/publications/5bc3312a-fe6b-410b-b1f7-8aa2b8a22c41 https://doi.org/10.1117/12.851142 eng eng International Society for Optics and Photonics SPIE info:eu-repo/semantics/closedAccess Oikarinen , K & Aikio , M 2010 , Small form-factor VGA camera with variable focus by liquid lens . in Optics, Photonics, and Digital Technologies for Multimedia Applications . , 772316 , International Society for Optics and Photonics SPIE , Proceedings of SPIE , vol. 7723 , SPIE Photonics Europe. Optics, Photonics, and Digital Technologies for Multimedia Applications , Brussels , Belgium , 12/04/10 . https://doi.org/10.1117/12.851142 adaptive optics camera design liquid lens variable focus contributionToPeriodical 2010 ftvttcrispub https://doi.org/10.1117/12.851142 2022-10-13T14:04:58Z We present the design of a 24 mm long variable focus lens for 1/4" sensor. The chosen CMOS color sensor has VGA (640×480) resolution and 5.6 μm pixel size. The lens utilizes one Varioptic Arctic 320 liquid lens that has a voltage-controllable focal length due to the electrowetting effect. There are no mechanical moving parts. The principle of operation of the liquid lens is explained briefly. We discuss designing optical systems with this type of lens. This includes a modeling approach that allows entering a voltage value to modify the configuration of the liquid lens. The presented design consists only of spherical glass surfaces. The choice to use spherical surfaces was made in order to decrease the costs of manufacturing and provide more predictable performance by the better established method. Fabrication tolerances are compensated by the adjustability of the liquid lens, further increasing the feasibility of manufacturing. The lens is manufactured and assembled into a demonstrator camera. It has an f-number of 2.5 and 40 degree full field of view. The effective focal length varies around 6 millimeters as the liquid lens is adjusted. In simulations we have achieved a focus distance controllable between 20 millimeters and infinity. The design differs from previous approaches by having the aperture stop in the middle of the system instead of in front. Other Non-Article Part of Journal/Newspaper Arctic VTT's Research Information Portal Arctic SPIE Proceedings, Optics, Photonics, and Digital Technologies for Multimedia Applications 7723 772316 |
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VTT's Research Information Portal |
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ftvttcrispub |
language |
English |
topic |
adaptive optics camera design liquid lens variable focus |
spellingShingle |
adaptive optics camera design liquid lens variable focus Oikarinen, Kari Aikio, Mika Small form-factor VGA camera with variable focus by liquid lens |
topic_facet |
adaptive optics camera design liquid lens variable focus |
description |
We present the design of a 24 mm long variable focus lens for 1/4" sensor. The chosen CMOS color sensor has VGA (640×480) resolution and 5.6 μm pixel size. The lens utilizes one Varioptic Arctic 320 liquid lens that has a voltage-controllable focal length due to the electrowetting effect. There are no mechanical moving parts. The principle of operation of the liquid lens is explained briefly. We discuss designing optical systems with this type of lens. This includes a modeling approach that allows entering a voltage value to modify the configuration of the liquid lens. The presented design consists only of spherical glass surfaces. The choice to use spherical surfaces was made in order to decrease the costs of manufacturing and provide more predictable performance by the better established method. Fabrication tolerances are compensated by the adjustability of the liquid lens, further increasing the feasibility of manufacturing. The lens is manufactured and assembled into a demonstrator camera. It has an f-number of 2.5 and 40 degree full field of view. The effective focal length varies around 6 millimeters as the liquid lens is adjusted. In simulations we have achieved a focus distance controllable between 20 millimeters and infinity. The design differs from previous approaches by having the aperture stop in the middle of the system instead of in front. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Oikarinen, Kari Aikio, Mika |
author_facet |
Oikarinen, Kari Aikio, Mika |
author_sort |
Oikarinen, Kari |
title |
Small form-factor VGA camera with variable focus by liquid lens |
title_short |
Small form-factor VGA camera with variable focus by liquid lens |
title_full |
Small form-factor VGA camera with variable focus by liquid lens |
title_fullStr |
Small form-factor VGA camera with variable focus by liquid lens |
title_full_unstemmed |
Small form-factor VGA camera with variable focus by liquid lens |
title_sort |
small form-factor vga camera with variable focus by liquid lens |
publisher |
International Society for Optics and Photonics SPIE |
publishDate |
2010 |
url |
https://cris.vtt.fi/en/publications/5bc3312a-fe6b-410b-b1f7-8aa2b8a22c41 https://doi.org/10.1117/12.851142 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Oikarinen , K & Aikio , M 2010 , Small form-factor VGA camera with variable focus by liquid lens . in Optics, Photonics, and Digital Technologies for Multimedia Applications . , 772316 , International Society for Optics and Photonics SPIE , Proceedings of SPIE , vol. 7723 , SPIE Photonics Europe. Optics, Photonics, and Digital Technologies for Multimedia Applications , Brussels , Belgium , 12/04/10 . https://doi.org/10.1117/12.851142 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1117/12.851142 |
container_title |
SPIE Proceedings, Optics, Photonics, and Digital Technologies for Multimedia Applications |
container_volume |
7723 |
container_start_page |
772316 |
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