Title: Field emission electron gun

Abstract: A field emission gun in which a field emission tip for generating charged particles is axially aligned with apertures in an intermediate electrode and a main electrode. A field electrode is placed in juxtaposition to the field emission tip for developing a particle generation field. This electrode is located relative to the field emission tip and the intermediate electrode to effect a predetermined focal distance and level of electron beam intensity. Use of a field electrode permits utilization of lower focusing and acceleration voltages and renders the device less sensitive to variations in field emission tip design and performance.

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Inventors: Coates, Vincent J. (Los Altos, CA, US)
Welter, Leonard M. (Saratoga, CA, US)

Application Number: 537880
Filing Date: 1975-01-02
Publication_date: 1976-01-06
Assignee: American Optical Corporation (Southbridge, MA)
Primary Class(es): 250/310 250/311, 313/336, 315/382
Other Classes:
US Patent Ref:

3141993	Jul, 1964	Hahn	315/31.
3191028	Jun, 1965	Crewe	250/311.

Other Refs:
Primary Examiner: Borchelt, Archie R.
Assistant Examiner: LaRoche, E. R.
Attorney: Berkenstock, Jr.; H. R., Nealon; William C.