Electric lamp and discharge devices – Discharge devices having a thermionic or emissive cathode
Reexamination Certificate
2007-10-02
2007-10-02
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
Discharge devices having a thermionic or emissive cathode
C313S309000, C313S34600R, C313S495000
Reexamination Certificate
active
10178273
ABSTRACT:
An object of the present invention is to enhance a converging property of an electron beam in an electron-emitting device in which a cathode electrode, an insulating layer, and a gate electrode are laminated and a through hole is formed by partially removing the gate electrode so as to obtain an exposed portion of the cathode electrode. In such an,electron-emitting device in which the cathode electrode, the insulating layer, and the gate electrode are laminated and the through hole is formed by partially removing the gate electrode so as to obtain the exposed portion of the cathode electrode, only a central region of the electron-emitting layer on the cathode electrode is connected to the cathode electrode. With this structure, it becomes possible to generate an electron beam only from the central region of the electron-emitting layer connected to the cathode electrode and to realize an electron-emitting device having a small beam diameter and a high-definition image-forming apparatus.
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Fitzpatrick ,Cella, Harper & Scinto
Patel Nimeshkumar D.
Quarterman Kevin
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