Image tube with truncated conical anode and a plurality of coaxial shield electrodes

Claim 1

AN IMAGE TUBE COMPRISING A PHOTOCATHODE, A PLURALITY OF ELECTRICALLY CONNECTED HOLLOW CYLINDRICAL MEMBERS DECREASING IN DIAMETER FROM A LARGE OPEN END ADJACENT TO SAID PHOTOCATHODE TO A SMALL OPEN END, SAID PHOTOCATHODE BEING DISPOSED TRANSVERSE TO THE AXIS OF SAID HOLLOW CYLINDRICAL MEMBERS AND SUBSTANTIALLY AT SAID LARGE OPEN END THEREOF, THE LAST TWO OF SAID PLURALITY OF HOLLOW CYLINDRICAL MEMBERS FROM SAID LARGE OPEN END BEING NESTED AND HAVING A SMALL ANNULAR SPACE BETWEEN THEM, A CHEMICAL CARRIER MOUNTED ON THE OUTER WALL OF THE LAST OF SAID CYLINDRICAL MEMBERS AND ON THE SIDE OF SAID ANNULAR SPACE REMOTE FROM SAID PHOTOCATHODE, A TRUNCATED CONICAL ANODE HAVING A SMALLER DIAMETER AND A BASE AXIALLY ALIGNED WITH SAID CYLINDRICAL MEMBERS, SAID SMALLER DIAMETER OF SAID ANODE BEING DISPOSED WITHIN THE LAST OF SAID CYLINDRICAL MEMBERS AND SUBSTANTIALLY AT SAID SMALL OPEN END OF SAID CYLINDRICAL MEMBERS, THE CROSSOVER POINT FOR ELECTRONS FROM SAID PHOTOCATHODE BEING WITHIN SAID SMALLER DIAMETER OF SAID ANODE, AN OPENENDED HOLLOW GLASS CYLINDER COAXIALLY POSITIONED WITH RESPECT TO SAID CYLINDRICAL MEMBERS AND SEALED TO THE FIRST OF SAID CYLINDRICAL MEMBERS AND SPACED LATERALLY FROM THE REMAINDER OF SAID CYLINDRICAL MEMBERS, SAID GLASS CYLINDER TERMINATING ADJACENT TO THE BASE OF SAID ANODE AND CLOSED BY A COLLECTOR ELECTRODE DISPOSED IN THE ELECTRON PATH DEFINED BY SAID PHOTOCATHODE AND ANODE.