High speed spark discharge print device

Claim 1

A SPARK DISCHARGE IMPACT PRINTING DEVICE COMPRISING IN COMBINATION (A) A SPARK GENERATOR INCLUDING ELECTRODE MEANS MOUNTED ON A REFLECTOR MEMBER, (B) SAID ELECTRODE MEANS BEING MOUNTED ON SAID REFLECTED MEMBER SUCH THAT A SPARK GAP IS FORMED BY SAID ELECTRODES ADJACENT A SURFACE OF SAID REFLECTOR MEMBER, (C) MEANS FOR PRODUCING A HIGH ENERGY SPARK DISCHARGE ACROSS SAID ELECTRODE MEANS PRESSURE WAVE REFLECTOR MEMBER, (D) FOCUSING MEANS POSITIONABLE ADJACENT SAID SURFACE OF SAID REFLECTOR MEMBER, SAID FOCUSING MEANS HAVING A FOCUSING PASSAGEWAY POSITIONABLE AT ONE END AGAINST SAID REFLECTOR SURFACE SO AS TO DEFINE A FINITE VOLUME OF A COMPRESSIBLE GAS IN THE REGION PROXIMATE SAID SPARK GAP, (E) A STENCIL MEMBER HAVING SHOCK WAVE AND PLASMA SHAPING APERTURES THEREIN OPERABLE FOR PRODUCING A DATA PATTERN OF SHOCK WAVES AND PLASMA FROM SHOCK WAVES AND PLASMA PRODUCED IN SAID GAS VOLUME IN SAID FOCUSING PASSAGEWAY, (F) MEANS FOR LOCATING SAID STENCIL MEMBER WITH SAID SHAPING APERTURES ADJACENT THE SECOND OPENING OF SAID FOCUSING PASSAGEWAY, (G) AND PLATEN MEANS FOR SUPPORTING PRESSURE SENSITIVE RECORD MATERIAL ADJACENT THE ANTERIOR SURFACE OF SAID STENCIL MEMBER IN IMPACT RECEIVING POSITION OVER SAID SHAPING APERTURES IN SAID STENCIL MEMBER.