(19)
(11) EP 0 641 007 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.06.1995 Bulletin 1995/25

(43) Date of publication A2:
01.03.1995 Bulletin 1995/09

(21) Application number: 94300660.1

(22) Date of filing: 28.01.1994
(51) International Patent Classification (IPC)6: H01J 1/15, H01J 1/28
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 31.08.1993 KR 9317566
31.08.1993 KR 9317567

(71) Applicant: SAMSUNG DISPLAY DEVICES CO., LTD.
Hwaseong-gun, Kyungki-do (KR)

(72) Inventors:
  • Kim, Chang-seob
    Suwon-city, Kyungki-do (KR)
  • Shon, Seok-bong
    Hwaseong-gun, Kyungki-do (KR)
  • Kim, Seok-gi
    Suwon-city, Kyungki-do (KR)
  • Jang, Dong-gil
    Hwaseong-gun, Kyungki-do (KR)
  • Jeong, Bong-uk
    Hwaseong-gun, Kyungki-do (KR)

(74) Representative: Crawford, Fiona Merle et al
Elkington and Fife Prospect House 8 Pembroke Road
Sevenoaks, Kent TN13 1XR
Sevenoaks, Kent TN13 1XR (GB)


(56) References cited: : 
   
       


    (54) Direct-heating-type dispenser cathode structure


    (57) A direct heating type-cathode structure is provided with filaments (200) which are secured to at least three points on the side surfaces of a porous pellet (100) formed of tungsten or molybdenum, and the cathode material thereof includes an alkaline earth metal oxide of barium. The thus-structured direct-heating-type cathode structure requires a temperature of only 950°C to 980°C to obtain the current density of 10A/cm² and is suitable for use in a color cathode ray tube and specifically in wide-screen televisions and industrial cathode ray tubes.






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