Infrared personal radiation warning device having a cantilever spring member for supporting a shutter

Claim 1

A PERSONAL RADIATION WARNING DEVICE FOR RAY ENERGY COMPRISING: A RAY ENERGY DETECTOR ADAPTED TO CONVERT RAY ENERGY TO AN ELECTRICAL SIGNAL RESPONSIVE IN AMPLITUDE TO THE INTENSITY OF RADIATION; A BASE SUPPORTING SAID DETECTOR AND MOUNTABLE ON A BODY CHARACTERIZED BY INHERENT VIBRATION AND MOTION SUCH AS A PERSON; A GRATING ADAPTED TO PROVIDE A MULTIPLE SHUTTER IN CONJUNCTION WITH SAID DETECTOR UPON MOTION RELATIVE TO THE LATTER; A SPRING ARM EXTENDING FROM RIGID CONNECTION TO SAID BASE AND HAVING A FREE END THEREOF FIXED TO SAID GRATING AND SERVING AS A SOLE SUPPORT FOR THE LATTER TO LOCATE SAID GRATING IN THE PATH OF RAY ENERGY STRIKING SAID DETECTOR, SAID SPRING ARM AND GRATING THEREON BEING ADAPTED TO VIBRATE SUBSTANTIALLY AT THE NETURAL FREQUENCY THEREOF EFFECTING TRANSVERSE OF SAID GRATING OVER THE PATH OF RAY ENERGY INCIDENT ON SAID DETECTOR EFFECTIVELY CHOPPING SAID RAY ENERGY INTO PULSES OF ENERGY THUS TO CONVERT THE OUTPUT SIGNAL OF SAID DETECTOR TO A SERIES OF PULSES THE AMPLITUDE OF WHICH IS SUBSTANTIALLY PROPORTIONAL TO THE INTENSITY OF SAID RAY ENERGY; A HOUSING EXTENDING ABOUT SAID BASE DETECTOR, GRATING AND SPRING ARM; A WINDOW IN SAID HOUSING ADAPTED FOR THE PASSAGE OF RAY ENERGY THERETHROUGH; MEANS SUPPORTING SAID BASE IN SAID HOUSING TO LOCATE SAID GRATING AND DETECTOR IN THE PATH OF RAY ENERGY ENTERING SAID HOUSING THROUGH SAID WINDOW; MEANS RESPONSIVE TO SAID SERIES OF PULSES FOR GENERATING A WARNING SIGNAL; AND MEANS EFFECTIVELY BIASING SAID PLATE RESPONSE MEANS TO A PREDETERMINED THERESHOLD CORRESPONDING TO A PREDETERMINED INTENSITY OF RAY ENERGY.