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1. (WO2018141962) HAPTIC SIGNALIZING DEVICE

Pub. No.:    WO/2018/141962    International Application No.:    PCT/EP2018/052809
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Tue Feb 06 00:59:59 CET 2018
IPC: G06F 3/01
Applicants: AITO BV
Inventors: RIIHIAHO, Jukka
KESKI-JASKARI, Turo
Title: HAPTIC SIGNALIZING DEVICE
Abstract:
A haptic signalizing device (10) comprises a number of piezoelectric elements (6b) arranged below a device surface (1) such that mechanical deformations caused by the converse piezoelectric effect in the at least one piezoelectric element (6b) make the device surface (1) to move such that the device surface (1) follows the piezoelectric element (6b) and a driving circuit (20, 30) configured to cause the converse piezoelectric effect on the at least one piezoelectric element (6b) by generating an alternating electric field over the piezoelectric element (6b) in a bipolar fashion, that is, consecutively in both the same and the opposite direction with respect to the polarization of the piezoelectric element (6b), to make the piezoelectric element (6b) to move beyond its initial position consecutively in both directions. The piezoelectric element (6b) is arranged i) to locally move the device surface (1) inwards when the mechanical deformation in the piezoelectric element (6b) is a deflection directed away from the device surface (1), and ii) to locally move the device surface (1) outwards when the mechanical deformation in the piezoelectric element (6b) is a deflection that is directed towards the device surface (1).