Jan 4, 2019 | By Cameron

On December 20, 2018, IBM filed a patent for “3D printing on the surface of an acoustic hologram.” The method makes use of an array of sound-wave emitters to generate a 3D hologram that consists of acoustic radiation forces (ARF) exerted by acoustic standing waves. An invisible but tactile force exists where the sound waves interact, and precisely controlling the wave emitters allows for defining the shape of the wave interaction and thus the shape of the hologram. By generating the hologram in a chamber filled with a gaseous medium, the hologram can be sprayed with droplets of a reactive material that solidifies upon exposure to the gaseous medium. The spray bonds to the semi-tangible surface of the acoustic hologram and solidifies as a hollow shell.

Excerpts from the abstract and claims:

“High-amplitude sound waves are capable of exerting a palpable force at a point in space that may feel at least partially solid to the touch. By emitting and focusing such sound waves in a particular configuration, it is possible to create a tactile illusion of a tangible but invisible three-dimensional “object” at a specific location in space.”

“...the sprayed printing medium is a fluid comprised of droplets that condense into a solid surface upon contact with the surface of the acoustic hologram.”

The patent number is US20180361680A1.



Posted in 3D Printing Application



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