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US5469014A Expired / Lapsed US ⏱️ 0.0 years remaining

Field emission element

Assignee: Futaba Corp
•
Filing: 1992-02-03
•
Granted: 1995-11-21
•
Expires: 2012-02-03
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Abstract

Abstract A field emission element including a gate and an emitter and capable of preventing any of the element oxide layer from being formed on a tip of the emitter to prevent a decrease in emission current, unstable operation and an increase in noise. The gate has a surface formed of a material of oxygen bonding strength higher than that of a material for at least a tip surface of the emitter, so that oxygen atoms and molecules containing oxygen entering the gate may be captured by adsorption on the gate to prevent formation of any oxide layer on the emitter. When a portion of the emitter other than the tip surface is formed of a material of oxygen bonding strength higher than that of the material for the tip surface, formation of any oxide layer on the tip surface of the emitter is minimized.

Inventors

  • 👤 Shigeo Itoh
  • 👤 Teruo Watanabe
  • 👤 Makoto Miyamori
  • 👤 Norio Nishimura
  • 👤 Junji Itoh
  • 👤 Seigo Kanemaru

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 08:33
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/06; H01J21/10; H01J21/105; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042; H01J3/00; H01J3/02; H01J3/021; H01J3/022; H01J9/00; H01J9/02; H01J9/022; H01J9/025; H01J2201/00; H01J2201/30; H01J2201/304; H01J2201/30403; H01J2201/30426

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 39 words
A field emission element comprising: an emitter having a tip portion; and a gate; said emitter tip portion comprising a material exhibiting an oxygen bonding strength lower than that of a material for the remaining portion of said emitter.
Claim 2
Dependent Claim 39 words
A field emission element comprising: an emitter having a tip portion; and a gate; said emitter tip portion comprising a material exhibiting an oxygen bonding strength lower than that of a material for the remaining portion of said emitter.
Claim 3
Dependent Claim 48 words
A field emission element as defined in claim 1 wherein said emitter is formed at at least said tip portion thereof, of a material selected from the group consisting of W, Mn, Ta, Nb, TiN, TiC and Mo and at the remaining portion thereof of Ti or Cr.
Claim 4
Dependent Claim 22 words
The field emission element according to Claim 1, wherein said tip portion is arranged at a distal end of said remaining portion.
Claim 5
Dependent Claim 55 words
A field emission element, comprising: an emitter; and a gate; said emitter including a base portion formed of a material having a first oxygen bonding strength, said emitter having a cover layer formed thereon, said cover layer being formed of a material having a second oxygen bonding strength lower than said first oxygen bonding strength.
Claim 6
Dependent Claim 55 words
A field emission element, comprising: an emitter; and a gate; said emitter including a base portion formed of a material having a first oxygen bonding strength, said emitter having a cover layer formed thereon, said cover layer being formed of a material having a second oxygen bonding strength lower than said first oxygen bonding strength.

References Cited (Backward Citations)

US3998678A Cited
US4410832A Cited
US4663559A Cited
US4835438A Cited
US4990766A Cited
US5012153A Cited
US5189341A Cited
US5256936A Cited
US5136205A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-11-20 1999-05-22 1999-11-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-11-20 2003-05-22 2003-11-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-11-20 2007-05-22 2007-11-21 $7700.00 Window Closed / Lapsed

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