Photographic camera and accessory

Claim 1

A PHOTOGRAPHIC CAMERA HAVING AN AUTOMATIC EXEXPOSURE CONTROL DEVICE, WITH A FLASH SYNCHRONIZING CIRCUIT AND A VOLTAGE SENSITIVE TRIGGER CIIRCUIT FOR TERMINATING EXPOSURE AT THE CONCLUSION OF ANN EXPOSURE INTERVAL IN RESPONSE TO THE INTENSITY OF LIGHT RECEIVED FROM THE SCENE BEING PHOTOGRAPHED, AND SAID TRIGGER CIRCUIT INCLUDING SELECTIVE IMPEDANCE MEANS AFFECTING THE RESPONSE OF SAID TRIGGER CIRCUIT, AND RECEPTACLE MEANS FOR RECEIVING A PLUG ASSOCIATED WITH PHOTOFLASH APPARATUS ADAPTED TO ILLUMINATE A SCENE TO BE PHOTOGRAPHED BY SAID CAMERA, SAID RECEPTACLE MEANS COMPRISING, IN COMBINATION: (A) A JACK FOR RECEIVING ELECTRICAL LEADS FROM SAID PHOTOFLASH APPARATUS, THEREBY CONNEETING SAID APPARATUS WITH SAID FLASH SYNCHRONIIZING CIRCUIT; (B) AT LEAST ONE PAIR OF ELECTRICAL CONTACTS COMPRISING A PORTION OF ISAID TRIGGER CIRCUIT AND COOPERATING WITH SAID SELECTIVE IMPEDANCE EMANS TO DETERMINE THE VALUE OF SAID IMPEDDANCE MEANN CONNECTED IN SAID TRIGGER CIRCUIT, SAID CONTACTS BEING SO POSITIONED THAT AT LEAST ONE CONTACTS BEING SO POSITIONED THAT THE OTHER CONTACT OF SAID PAIR WHEN SAID PLUUG IS INSERTED IN SAID RECEPTACLE MEANS, THEREBY ALTERING THE ELECTRICAL PARAMETERS OF SAID TRIGGFER CIRCUIT; AND (C) MEANS FOR MOVING SAID ONE CONTACT BACK TO ITS ORIGINAL POSITION RELATIVE TO SAID OTHER CONTACT IN RESPONSE TO REMOVAL OF SAID PLUG FROM SAID RECEPTACLE MEANS, WHEREBY SAID ELECTRICAL PARAMETERS ARE RESTORED TO THEIR ORIGINAL CONDITION.