Photoflash lamp

Claim 1

A CONTAINER FOR CONFINING THE PRODUCTS OF A BRIEF DURATION, LIGHT PRODUCING EXOTHERMIC REACTION COMPRISING A FLEXIBLE HERMETICALLY SEALED CONTAINER HAVING A FRONT WALL AT LEAST A PORTION OF WHICH IS TRANSPARENT, AND A REAR WALL, AND FORMED TO CONTAIN THE REACTION PRODUCTS, MEANS FORMING A REFLECTIVE SURFACE POSITIONED BETWEEN THE REACTION PRODUCTS AND SAID CONTAINER REAR WALL, A TRANSPARENT PROTECTIVE MATERIAL POSITIONED BETWEEN SAID REACTION PRODUCTS AND SAID CONTAINER FRONT WALL, BOTH SAID REFLECTIVE SURFACE AND SAID TRANSPARENT MATERIAL PROTECTING THE CONTAINER FROM PERFORATION BY IMPACT OF THE MATERIAL REACTION PRODUCTS AND FROM DESTRUCTION BY THE HEAT PRODUCED BY THE REACTION TO PRESERVE THE HERMETIC SEAL DURING AND AFTER THE REACTION, A PLURALITY OF INDENTATIONS OF PARABOLIC CROSS SECTION FORMED IN SAID REFLECTIVE SURFACE, THE LOCUS OF THE FOCI OF SAID PARABOLIC INDENTATIONS FORMING A PLANE WHICH FALLS WITHIN SAID CONTAINER, AND PLANAR POSITIONED LIGHT PRODUCING MEANS WITHIN SAID CONTAINER HAVING THE MEDIAN THEREOF COINCIDING WITH SAID PLANE TO CAUSE THE LIGHT PRODUCED DURING THE REACTION TO BE PROJECTED IN A PREFRRED DIRECTION.