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Novel Variable Focus Lens with Large Optical Aperture

Researchers at the University of Tokyo have fabricated a prototype of a variable focus lens with a large optical aperture of 26 mm. Compared with liquid-air lenses and liquid-liquid lenses, the researchers believe that their lens - one with such a large aperture that can also achieve high optical performance - is the first of its kind. One goal the researchers have is to develop eyeglasses for presbyopia sufferers, who have vision difficulties while focusing from near to far objects. The new system is based on a sandwiched structure. A piece of deformable elastomer separates the system into two chambers. These chambers are infused with two different fluids. If one fluid can be made to flow into and out of its chamber, the lens can shift its power dynamically by means of a syringe pump.

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Cameras Imaging Medical Optics Photonics

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    Transcript

    00:00:01 this video introduces a variable Focus lens with a large Optical aperture the system is based on a sandwich structure a piece of deformable elastomer separates the system into two Chambers these Chambers are infused with two different fluids if one fluid can be made to flow into and out of its chamber the lens can shift its power dynamically by means of a syringe pump based on this

    00:00:28 concept a prototype of variable Focus lens with a 26 mm aperture was fabricated however there is no technical challenge involved in making the aperture even larger to test its tunable performance a target with a grid pattern was placed on one side of the lens while a camera records the images from the other side when the camera is in place the autofocus function is turned

    00:00:51 off the target remains at a fixed distance so we could confirm that the lens was changing its power dynamically from positive to negative a depth of field Target consisting of a set of smaller trees was used in a second experiment as the lens changes its focal length the focusing Point dynamically shifts from the near Target to the far

    00:01:24 Target presbyopia sufferers have Vision difficulties while focusing from near to far objects so one of our goals is to develop a pair of diopter adjustable eyeglasses