Electro-optical pulse counter

Claim 1

AN ELECTROLUMINESCENT DEVICE COMPRISING FIRST AND SECOND SETS OF PHOTOCONDUCTOR-ELECTROLUMINESCENT UNITS, EACH SET CONTAINING A LIKE PLURALITY OF SAID UNITS ARRANGED IN A LINEAR ARRAY, SAID PLURALITY BEING EQUAL TO N WHERE N IS ANY INTEGER GREATER THAN 1, EACH UNIT CONSISTING OF AN ELECTROLUMINESCENT CELL AND A PHOTOCONDUCTIVE ELEMENT ELECTRICALLY CONNECTED IN SERIES, ALL FIRST SET UNITS BEING CONNECTED IN PARALLEL BETWEEN FIRST AND SECOND TERMINALS, ALL SECOND SET UNITS BEING CONNECTED IN PARALLEL BETWEEN A THIRD TERMINAL AND SAID SECOND TERMINAL, THE CELL AND ELEMENT OF EACH FIRST SET UNIT BEING OPTICALLY COUPLED TOGETHER, THE CELL AND ELEMENT OF EACH SECOND SET BEING OPTICALLY ISOLATED FROM EACH OTHER, EACH SECOND SET ELEMENT BEING OPTICALLY COUPLED TO A CORRESPONDING FIRST SET CELL; AND FIRST AND SECOND GROUPS OF PHOTOCONDUCTIVE ELEMENTS, THE NUMBER OF ELEMENTS IN EACH GROUP BEING EQUAL TO (N-1), EACH FIRST SET CELL OTHER THAN THE LAST CELL IN THE FIRST SET SHUNTING A CORRESPONDING FIRST GROUP ELEMENT, EACH FIRST SET CELL OTHER THAN THE FIRST CELL IN THE FIRST SET BEING CONNECTED THROUGH A CORRESPONDING SECOND GROUP ELEMENT TO A FOURTH TERMINAL, EACH FIRST GROUP ELEMENT BEING OPTICALLY COUPLED TO THE FIRST SET CELL IMMEDIATELY PRECEDING THE FIRST SET CELL SHUNTED BY IT, EACH SECOND SET CELL OTHER THAN THE LAST CELL IN THE SECOND SET BEING OPTICALLY COUPLED TO THE SECOND GROUP ELEMENT WHICH IS CONNECTED TO THE FIRST SET CELL IMMEDIATELY PRECEDING THE FIRST SET CELL CORRESPONDING TO SAID EACH SECOND SET CELL.