Device for locating an impact against a transparent interactive surface

Abstract

This device for locating an impact against a transparent interactive surface comprises at least three transducers distributed against the interactive surface and at least one calculator programmed to locate the impact by analysing time differences of propagation 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. It further comprises: a protective case, integral with the transparent interactive surface, intended to receive at least a portion of an electronic device with a display screen in such a way as to place the display screen facing the transparent interactive surface; means for adjusting the display screen for the centring thereof on a mark carried by a marking on the transparent interactive surface; and a calculator programmed to convert the location of the impact in the transparent interactive surface into a location of the impact in the display screen.

1 . A device for locating an impact against a transparent interactive surface able to propagate progressive mechanical waves from the impact, comprising:
 the transparent interactive surface against which are arranged and distributed at least three transducers designed to capture the progressive mechanical waves propagating in the transparent interactive surface and to transform them into electrical signals,   an electronic central unit, connected to the transducers in order to receive their electrical signals,   a calculator programmed to identify instants of impact detection in the electrical signals received by the electronic central unit, and   a calculator programmed to locate the impact in the transparent interactive surface by analysing time differences of propagation of progressive mechanical waves from the impact to the transducers on the basis of the instants of impact detection identified,   characterised in that it further comprises:   a protective case integral with the transparent interactive surface and of which the interior volume is intended to receive at least a portion of an electronic device with a display screen in an arrangement according to which the display screen is placed facing the transparent interactive surface, the protective case having an opening through which said at least one portion of the electronic device can be inserted,   means, integral with the protective case, for adjusting a positioning of the display screen with respect to the transparent interactive surface for a centering of the display screen on a marker carried out by a marking on the transparent interactive surface, and   a calculator programmed to convert the location of the impact in the transparent interactive surface into a location of the impact in the display screen when said at least one portion of the electronic device is inserted into the protective case and when the positioning of the display screen is adjusted.   
     
     
         2 . The device for locating an impact according to  claim 1 , wherein the protective case is shaped in such a way as to receive in its interior volume one of the elements of the set formed of a mobile telephone, a digital tablet, a flat screen support for portable computer, a keyboard support for portable computer, a monitor for computer, a television receiver and a video projector associated with a rear projection screen. 
     
     
         3 . The device for locating an impact according to  claim 1 , wherein the transparent interactive surface is designed in a material of sufficient rigidity, in particular polycarbonate, so that the impact does not significantly affect the display screen of the electronic device when the positioning of the display screen is adjusted. 
     
     
         4 . The device for locating an impact according to  claim 1 , wherein one of the walls of the protective case comprises the transparent interactive surface and the interior volume of the protective case is intended to receive at least the display screen of the electronic device. 
     
     
         5 . The device for locating an impact according to  claim 4 , comprising a closure element of the opening through which the display screen can be inserted, in particular a hermetic closure element. 
     
     
         6 . The device for locating an impact according to  claim 1 , comprising:
 an autonomous and rechargeable source of electrical energy integral with the protective case, or   means of electrical connection to the electronic device,   for an electrical power supply of the electronic central unit which is integral with the protective case.   
     
     
         7 . The device for locating an impact according to  claim 1 :
 wherein the transparent interactive surface is designed in such a way as to have an inclination towards the front by a non-zero angle with respect to the vertical when the protective case is arranged on a stable support, and   further comprising a receptacle which is arranged to collect projectiles of which a trajectory is deviated by the inclined transparent interactive surface.   
     
     
         8 . The device for locating an impact WPM according to  claim 7 , wherein the receptacle includes a damping material and is removably mounted and/or as a pivot connection on the protective case. 
     
     
         9 . The device for locating an impact according to  claim 1 , comprising the electronic device connected to the electronic central unit and wherein at least one of said calculators is integrated into the means for calculation of the electronic device. 
     
     
         10 . The device for locating an impact according to  claim 1 , wherein:
 a divergent lens is interposed between the display screen of the electronic device and the transparent interactive surface, when said at least one portion of the electronic device is inserted into the protective case and when the positioning of the display screen is adjusted, and   a rear projection sheet is spread over an inner face of the transparent interactive surface.