PRIMER FOR DELAYED-ACTION ELECTRIC BLASTING CAP WITH AT LEAST ONE MAIN CHARGE IN BLASTING CAP CASING Russian patent published in 1995 - IPC

FIELD: initiation of blasting caps with electronic delay of blast signal. SUBSTANCE: primer has at least one semiconductor crystal with an integrated circuit, which is connected to the substrate through surface wiring or direct connection between exposed contact areas positioned on the surface of semiconductor crystal with respective contact areas of circuit pattern on the substrate that is made flexible or has a thickness less than 1 mm, and is attached by a fastener. The electrical primer head can be located on the surface of the semiconductor crystal. The circuit pattern on the substrate may have a spark discharger made in a thin metallic layer. EFFECT: improved design. 20 cl, 5 dwg