| (19) |
 |
|
(11) |
EP 0 253 316 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
21.03.1990 Bulletin 1990/12 |
| (43) |
Date of publication A2: |
|
20.01.1988 Bulletin 1988/03 |
| (22) |
Date of filing: 09.07.1987 |
|
| (51) |
International Patent Classification (IPC)4: H01J 61/06 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB NL |
| (30) |
Priority: |
15.07.1986 JP 108595/86 U
15.07.1986 JP 108597/86 U
15.07.1986 JP 108598/86 U
|
| (71) |
Applicants: |
|
- TDK Corporation
Chuo-ku,
Tokyo-to 103 (JP)
- MITSUBISHI DENKI KABUSHIKI KAISHA
Tokyo 100 (JP)
|
|
| (72) |
Inventors: |
|
- Iwaya, Shouichi
Chuo-ku
Tokyo (JP)
- Masumura, Hitoshi
Chuo-ku
Tokyo (JP)
- Hamada, Munemitsu
Chuo-ku
Tokyo (JP)
- Adachi, Hiromi
Ohfuna Seisakusho
Ohfuna 5-chome
Kamakura-shi
Kanagawa-ken (JP)
|
| (74) |
Representative: Steinmann, Otto C. et al |
|
Kanzlei Dres. Münich, Neidl-Stippler, Schiller,
Willibaldstr.36/38
D-80689 München
D-80689 München (DE) |
|
| |
|
| (54) |
Cold cathode type discharge lamp apparatus |
(57) A cold cathode type discharge lamp apparatus of the invention is composed of a discharge
lamp tube, a cathode electrode member in nearly cylindrical form made of a semiconductor
porcelain and including an apex made a discharge surface, a sealing support member
for sealing and supporting the cathode electrode member within the tube, and a lead
wire connected to the cathode electrode member. In such discharge lamp apparatus,
since an electron emission material is not used in the cathode electrode but the semiconductor
porcelain is used, chemical reaction due to heating is not used, thereby blackening
of the light emission tube is prevented and the life becomes long.