Electron emitting element

Abstract

Abstract PURPOSE:To reduce the deterioration of a tip section, obtain a large discharge current, produce an element easily, and make it thin, small-sized and lightweight by providing an extracting electrode between an electron emitting electrode and a secondary electron emitting electrode and precisely forming the tip section of the electron emitting electrode and the opening section of the extracting electrode. CONSTITUTION:An extracting electrode 6 with an opening section 6a is provided between the tip section 2a of an electron extracting electrode 2 and a secondary electron emitting electrode 3, and at least the tip section 2a is machined to reduce its radius of curvature by the fine machining technique. When the low voltage is applied to this extracting electrode, electrons 4 are stably emitted, when the high voltage is applied to the secondary electron emitting electrode 3, electrons 4 hit the secondary electron emitting electrode 3 to emit many secondary electrons 5 in the rectangular direction to an insulating substrate 1. The voltage applied across the electron emitting electrode and the extracting electrode can be thereby lowered, the deterioration of the tip section can be sharply reduced, and an element can be easily made thin, small-sized and lightweight.

Inventors

• 👤 Ichiro Nomura
• 👤 Hidetoshi Suzuki
• 👤 Seishiro Yoshioka
• 👤 Toshihiko Takeda
• 👤 Tetsuya Kaneko
• 👤 Yoshikazu Sakano
• 👤 Kojiro Yokono

Bibliographic Details