| 摘要 |
<p>PURPOSE: To prevent the falling off of a microchip formed in a cathode from the cathode and make illumination brightness constant. CONSTITUTION: Many microchips 21 are integrally formed with a cathode 22, an insulating layer 4 formed in the periphery of each microchip 21 is formed in almost the same as the microchip 21, and a gate 3 is formed on the insulating layer 4. The tip of the microchip 21 is made lower by the specified height than the gate 3, the wear of the microchip 21 by ion bombardment is minimized, and the falling off of the microchip 21 from the cathode 22 can be prevented.</p> |
