ELECTRON EMISSION SYSTEM

申请公布号：

DE3474232(D1)

申请号：

DE19843474232

申请日期：

1984.06.08

申请公布日期：

1988.10.27

申请人：

AMERICAN TELEPHONE AND TELEGRAPH COMPANY

发明人：

LIU, RUICHEN;THOMSON, MICHAEL, GEORGE

分类号：

H01J1/30;H01J1/304;H01J37/073;H01J37/305;H01L21/30;(IPC1-7):H01J37/073

主分类号：

H01J1/30

摘要：

An electron emission system includes a high-brightness field-emitter cathode. Advantageously, the tip of the cathode is shaped to minimize structural variations caused by surface tension forces. In addition, an electrode assembly associated with the cathode is designed to establish electric field forces that are opposite and at least approximately equal to the surface tension forces acting on the tip. The electric field forces can be adjusted to establish a highly stable operating condition without altering the value of electron beam energy for which the overall system was designed. Moreover, the current density of the beam at a writing surface can be selectively varied without changing prescribed operating parameters of the cathode. The resulting system is characterized by excellent emission stability, low noise and a useful operating life of at least several thousand hours.