Patent ID: 11921958
Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Field: Computer technology (Electrical engineering)
Classification: CPC G  B | IPC G

Claim 0:
1. A haptic interface of a ‘mid-air’ type, comprising:
a control circuit; and
a plurality of ultrasonic transducers connected to said circuit, which includes a first set of transducers emitting at a first ultrasound carrier frequency and at least a second set of transducers emitting at a second ultrasound carrier frequency different from the first, wherein
the control circuit is configured to modulate signals sent to the transducers to:
generate, with ultrasound waves emitted by at least a part of the transducers of the first set, an acoustic pressure detectable by touch within at least a first focal region, and
generate, with ultrasound waves emitted by at least a part of the transducers of the second set, an acoustic pressure detectable by touch within at least a second focal region,

a size of and/or materials of the second set of transducers differ from a size of and/or materials of the first set of transducers, and
the first set of transducers and the second set of transducers emit within a 20 kHz-150 kHz carrier frequency range.