| 摘要 |
<p>PURPOSE:To obtain a stable quantity of electron emission, by driving an electron emitting element using electric charge stored in a charge accumulating means, and making it emit electrons. CONSTITUTION:A condenser 2 is charged by closing a switch. Then the voltage between both terminals of an electron emitting element 1 also rises, but a non- conduction state is kept till a trigger signal inputs. After that the switch is opened, and the trigger signal is applied to a gate electrode G from a trigger generating circuit 3. Then the electron emitting element 1 turns on a conduction state in a manner similar to a thyristor, and electric charge of quantity Q1 stored in the condenser 2 flows through the electron emitting element 1. Thereby the electron emitting element 1 is driven and emits electrons. Therefor, stable electron emission is realized only by setting the quantity of charge stored in the condenser 2 at a constant value.</p> |
