High pressure discharge lamp and method of production therefor
AssigneeNEC Microwave Tube, Ltd.
InventorsKazuhisa Nishida, Toshimoto Makino
Life of this patent
Estimating the term…
Abstract
A high pressure discharge lamp includes a quartz glass bulb and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas which are airtightly sealed in the quartz glass bulb. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−6 μmol/mm3 and 1×10−8 μmol/mm3. The pair of electrodes contain potassium oxide in the range between about 20 ppm and 40 ppm.
Claims7
A high pressure discharge lamp, comprising:
- a quartz glass bulb;
- and
- a pair of electrodes, each electrode of said pair of electrodes being disposed so as to be opposite the other in said quartz glass bulb, wherein
- at least mercury and a halogen gas are airtightly sealed in said quartz glass bulb, and
- the partial pressure of oxygen (O) in said quartz glass bulb is about 2.5×10−3 Pa or less, the partial pressure of said halogen gas in said quartz glass bulb is in the range between about 1×10−6 μmol/mm3 and 1×10−8 μmol/mm3, and said pair of electrodes contain potassium oxide in the range between about 20 ppm and 40 ppm.
Dependencies are inferred from the claim text.