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liquid lens

Since mobile phones, smartphones and tablets

are extremely compact and space-saving, conventional lens systems with their mechanical focusing devices cannot be used in these devices. Liquid lenses, in which the shape of a drop of liquid is changed, have been developed for these applications. Liquid lenses use mechanical forces or the electrowetting effect

with which thesurface shape of liquids can be changed. In mechanical liquid lenses, the polymer liquid is sandwiched between a solid substrate and a flexible membrane. To change the focal length

, additional fluid is forced into the lens from a reservoir, causing the membrane to deform spherically.

Structure of a liquid lens

Structure of a liquid lens

With such mechanically working liquid lenses, focal lengths between 20 mm and 1,000 mm can be set.

Liquid lenses with electrowetting, photo: sunex.com

Liquid lenses with electrowetting, photo: sunex.com

Another technique uses the electrowetting effect with which the shape of liquid droplets can be controlled with an electric field. Liquid lenses working on this principle are only a few millimetres small and are ideal for wearable cameras and mobile phone cameras. Their focal length can be controlled from a few millimeters to infinity.

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Englisch: liquid lens
Updated at: 29.03.2018
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