Noncontact Tactile Display Based on Radiation Pressure of Airborne Ultrasound

Authors:
Takayuki Hoshi;Masafumi Takahashi;Takayuki Iwamoto;Hiroyuki Shinoda
Affiliations:
Kumamoto University, Kumamoto;The University of Tokyo, Tokyo;The University of Tokyo, Tokyo;The University of Tokyo, Tokyo
Venue:
IEEE Transactions on Haptics
Year:
2010

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Abstract

This paper describes a tactile display which provides unrestricted tactile feedback in air without any mechanical contact. It controls ultrasound and produces a stress field in a 3D space. The principle is based on a nonlinear phenomenon of ultrasound: Acoustic radiation pressure. The fabricated prototype consists of 324 airborne ultrasound transducers, and the phase and intensity of each transducer are controlled individually to generate a focal point. The DC output force at the focal point is 16 mN and the diameter of the focal point is 20 mm. The prototype produces vibrations up to 1 kHz. An interaction system including the prototype is also introduced, which enables users to see and touch virtual objects.