| 摘要 |
<p>PURPOSE:To make emission of electrons possible for which wiring connection is not required and mounting degree is high by supplying after electron emitting action, electric charge of an electron emitting electrode lost by emission of electrons at the time of the emitting action. CONSTITUTION:At the time of action of electron emission, positive charge is accumulated on an electron emitting electrode 4, and intensity of magnetic field is weakened, so emission quantity of electrons is reduced, and finally emission of electrons stops. Then, by using a switching means 10, a voltage of the opposite direction is applied between a pulling electrode 7 and a voltage applying electrode 1, while potential of a voltage applied to a matter subject to irradiation 5 is set at 0V by means of a switching means 11, so electrons are emitted from the pulling electrode 7 to the side of the electron emitting electrode 4. Emitted electrodes are connected with positive electric charge accumulated on the electron emitting electrode 4 to reduce and eliminate the accumulated positive electric charge, where the electron emitting electrode 4 is ready for emission of electrons. Thus it is possible to let an electron emitting electrode provided solely on the surface of insulation perform emission of electrons. Electron emission is to be performed by two or more electron emitting electrodes.</p> |
