Patent ID: 9279645
Filing Date: 2016-03-08
CPC Classification: F42B,F42C,F42D

Claim Text:
1. An electronic detonator comprising: an explosive charge; an initiating element which is exposed to the explosive charge; a control circuit; a housing at least partially surrounding the explosive charge, the initiating element, and the control circuit; at least one coil having a plurality of windings arranged inside the housing in a tubular configuration, wherein the coil includes a first end, an opposed second end and a hollow interior between the first and second ends; a magnet which is held at rest position that is displaced from the coil; a passage which extends from the rest position to the first end of the coil, through the hollow interior to the second end of the coil and then to a remote position; a shock tube connected to the housing; at least one sensor to detect one or more characteristics which are uniquely associated with a genuine shock tube event; a connector for connecting the shock tube to the housing with an end of the shock tube positioned proximate to the magnet at the rest position whereby the magnet is operable to move along the passage by the effect of a pressure wave produced upon ignition of the shock tube to produce electrical energy and at least part of said electrical energy is used to power the control circuit, wherein the control circuit associates said movement of the magnet with a genuine shock tube event only if during such movement or within a predetermined time period thereafter the at least one sensor detects one or more characteristics which are uniquely associated with a genuine shock tube event, wherein the at least one coil, upon detecting a communication signal, provides energy for operation of the control circuit during a communication phase and wherein the control circuit distinguishes energy produced in the at least one coil by movement of the magnet from energy produced in the at least one coil by a communication signal.