Global Patent Index - EP 0982758 A2

EP 0982758 A2 2000-03-01 - Discharge lamp and electrode therefor

Title (en)

Discharge lamp and electrode therefor

Title (de)

Entladungslampe und hierfür geeignete Elektrode

Title (fr)

Lampe à décharge et electrode pour ladite lampe

Publication

EP 0982758 A2 (EN)

Application

EP 99116573 A

Priority

JP 25327798 A

Abstract (en)

The electrode for discharge lamp of the invention is that a cylindrical container 1 opening at one side is provided, and electron emission materials 2 are supported therein, the container 1 and the electron emission materials 2 are main elements of compound oxides containing, as metallic elemental components, a first component comprising at least one kind of Ba, Sr and Ca, a second component comprising at least one kind of Zr and Ti, and a third component comprising at least one kind of Ta and Nb and/or compound oxides containing nitrogen. The present electrode for discharge lamp is that the content percentage of the first component in exposed faces of the electron emission materials 2 seen from the opening side of the container 1 is higher than content percentage of the first component in an end face of the opening side of the container 1. Further, the electron emission materials are porous ones having percentage of void being 45 to 80%. <IMAGE>

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

H01J 61/067

IPC 8 full level (invention and additional information)

H01J 61/06 (2006.01); H01J 61/067 (2006.01); H01J 61/09 (2006.01); H01J 61/12 (2006.01)

CPC (invention and additional information)

H01J 61/09 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0982758 A2 20000301; EP 0982758 A3 20020327; CN 1154151 C 20040616; CN 1254938 A 20000531; JP 2000067810 A 20000303; KR 20000017442 A 20000325

INPADOC legal status


2003-08-06 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020928

2002-12-18 [AKX] PAYMENT OF DESIGNATION FEES

2002-03-27 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-03-27 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI

2000-03-01 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-03-01 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI