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Lestelle, Dominique

Robert Boden

Jean-Marc Alexandre

Christian Bolzmacher

Dominique Lestelle

This installation for locating impacts comprises an interactive plate, at least three transducers arranged and distributed against the interactive plate in order to pick up progressive mechanical waves propagating therein and to transform them into electrical signals, and an electronic central unit programmed to locate an impact in the interactive plate by an analysis of the electrical signals that it receives from the transducers. It further includes an additional plate attached to the front face of the interactive plate and having an impact-receiving zone, and means for attaching the additional plate to the interactive plate, configured to ensure contact against the entire portion of the front face of the interactive plate located opposite the impact-receiving zone of the additional plate.

Setup for locating impacts with interactive plate and transducers

This method for manufacturing a device for locating an impact comprising an interactive surface having a front face for receiving an impact and at least three transducers that need to be distributed and attached against the front face or a rear face of the interactive surface, comprises the following steps: determining a central positioning point for each transducer on the front face or rear face of the interactive surface; attaching each transducer, via the lower conductive layer thereof forming a first electrode, around the central positioning point thereof. It further comprises, following the attachment of each transducer, a step of machining the free upper conductive layer of at least one of the transducers, using a machine tool, at least as far as a piezoelectric intermediate layer of this transducer, in order to form a second electrode of this transducer, centering it around the central positioning point thereof.

Method for manufacturing a device for locating an impact having at least three transducers attached against an interactive surface

A device for locating an impact against an interactive surface includes at least three transducers distributed against the interactive surface and an electronic central unit programmed to locate the impact by analysing propagation time differences of progressive mechanical waves from the impact to the transducers on the basis of instants of impact detection identified in the electrical signals supplied by the transducers. The electronic central unit is programmed to trigger an impact detection from a first instant when at least one M-th derivative from at least one of the received electrical signals exceeds a predetermined non-zero threshold value and for then determining, for each electrical signal received from each transducer, at least one second instant, subsequent to the first instant, of the first zero crossing of at least one N-th derivative of this electrical signal, from which is identified at least one instant of impact detection.

Device for locating an impact against an interactive surface, corresponding facilities, method and computer program

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Dourdan, France

Robert Boden