| 发明名称 |
Discharge lamp having a cathode with a sintered tip insert |
| 摘要 |
A discharge lamp in which vaporization and melting of a cathode tip are prevented and which has stable luminous operation over a long is achieved according to the invention by the fact that the discharge lamp has a cathode in which a sintered body made of a powdered metal with a high melting point and a powdered emitter material is inserted in the tip, and the relationship:(-0.002d+0.01)</=D/W</=(-0.002d+0.04) is fulfilled, where D is an outside diameter of the sintered body in millimeters (mm), W is a lamp input power in watts (w) and d is a distance between the anode and cathode in millimeters (mm). Furthermore, these benefits are achieved according to the invention by encapsulating mercury in an amount of 10 mg to 80 mg/cc of fluorescent tube internal volume and inert gas with at least 2 atm air pressure (at a reference temperature of 25 DEG C.).
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| 申请公布号 |
US5627430(A) |
申请公布日期 |
1997.05.06 |
| 申请号 |
US19950496904 |
申请日期 |
1995.06.29 |
| 申请人 |
USHIODENKI KABUSHIKI KAISHA |
发明人 |
KIRA, TAKEHIRO;SERIZAWA, TAKANORI;ARIO, KOICHI |
| 分类号 |
G03F7/20;H01J61/073;(IPC1-7):H01J61/04 |
主分类号 |
G03F7/20 |
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