Ignition coil for internal combustion engine

Claim 1

An internal combustion engine ignition coil comprising a rectangular magnetic core having a median line in a single plane and consisting essentially of a stack of sheets of magnetic material, each layer of which is formed from two substantially identical L-shaped members each having two arms of the same width, so that there are two stacks of L-shaped members in which the corners of the L-shaped members are superimposed; said rectangular core being devoid of magnetic shunt elements, said core having only one primary inductive winding and only one secondary high voltage winding thereon; said primary inductive winding on one arm of one stack of L-shaped members, and said secondary high voltage winding on the other arm of said one stack; said primary winding having a length L parallel to said one arm, and a thickness perpendicular to said one arm which is in the range between L/50 and L/8; said secondary winding having a length l parallel to said other arm, and a thickness perpendicular to said other arm which is in the range of between l and 6l; a plane through one end of one of said windings perpendicular to its arm intersecting both ends of the other winding.