Global Patent Index - EP 0809271 A3

EP 0809271 A3 2000-03-15 - Electron gun

Title (en)

Electron gun

Title (de)

Elektronenkanone

Title (fr)

Canon à électrons

Publication

EP 0809271 A3 (EN)

Application

EP 97303476 A

Priority

US 65162696 A

Abstract (en)

[origin: EP0809271A2] The present invention pertains to an electron gun. The electron gun comprises an RF cavity having a first side with an emitting surface and a second side with a transmitting and emitting section. The gun is also comprised of a mechanism for producing an oscillating force which encompasses the emitting surface and the section so electrons are directed between the emitting surface and the section to contact the emitting surface and generate additional electrons and to contact the section to generate additional electrons or escape the cavity through the section. The section preferably isolates the cavity from external forces outside and adjacent the cavity. The section preferably includes a transmitting and emitting screen. The screen can be of an annular shape, or of a circular shape, or of a rhombohedron shape. The mechanism preferably includes a mechanism for producing an oscillating electric field that provides the force and which has a radial component that prevents the electrons from straying out of the region between the screen and the emitting surface. Additionally, the gun includes a mechanism for producing a magnetic field to force the electrons between the screen and the emitting surface. The present invention pertains to a method for producing electrons. The method comprises the steps of moving at least a first electron in a first direction. Next there is the step of striking a first area with the first electron. Then there is the step of producing additional electrons at the first area due to the first electron. Next there is the step of moving electrons from the first area to a second area and transmitting electrons through the second area and creating more electrons due to electrons from the first area striking the second area. These newly created electrons from the second area then strike the first area, creating even more electrons in a recursive, repeating manner between the first and second areas.

IPC 1-7 (main, further and additional classification)

H01J 3/02

IPC 8 full level (invention and additional information)

H05H 7/22 (2006.01); H01J 3/02 (2006.01); H01J 23/06 (2006.01)

CPC (invention and additional information)

H01J 3/023 (2013.01)

Citation (search report)

[XA] MAKO F.M & PETER W: "A high-current micro-pulse electron gun", PROC: PARTICLE ACCELERATOR CONFERENCE, 17 May 1993 (1993-05-17) - 20 May 1993 (1993-05-20), pages 2702 - 2704, XP002128262, ISBN: 0-7803-1203-1

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

EP 0809271 A2 19971126; EP 0809271 A3 20000315; CA 2205989 A1 19971122; CA 2254137 A1 19971127; EP 0900446 A1 19990310; IL 120874 D0 19970930; JP H1055763 A 19980224; WO 9744804 A1 19971127

INPADOC legal status


2004-03-24 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030917

2002-07-31 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020613

2000-07-26 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000530

2000-03-15 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): DE FR GB IT NL

1997-11-26 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): DE FR GB IT NL