High pressure discharge lamp
AssigneeNEC Microwave Tube, Ltd.
InventorsKazuhisa Nishida, Yasuhiro Akiyama
Life of this patent
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Abstract
A high pressure discharge lamp includes: a quartz glass bulb having an expanded portion and sealing portions; conductive elements, and a pair of electrodes. The conductive elements are airtightly sealed at the sealing portions of the quartz glass bulb. Each electrode of the pair of electrodes is disposed so as to be opposite the other and each electrode is connected to one of the conductive elements. An angle θ1 between a tangent along the inner surface of the expanded portion at a position 0.5 mm away from an origin of one of the sealing portions along the length direction of each electrode and the direction of the length of each electrode is at least about 40°.
Claims28
A high pressure discharge lamp, comprising:
- a quartz glass bulb having an expanded portion and sealing portions;
- conductive elements airtightly sealed at said sealing portions of said quartz glass bulb;
- and
- a pair of electrodes, each electrode of said pair of electrode electrodes being disposed so as to be opposite the other and each of said electrodes being connected to one of said conductive elements,
- wherein an angle θ1 between a tangent along the inner surface of said expanded portion at a position 0.5 mm away from an origin of one of said sealing portions along the length of each of said electrodes and the direction along the length of each of said electrodes is at least about 40°, and
- wherein an inert gas is contained in said high pressure discharge lamp at a pressure of at least 6 kPa.
A high pressure discharge lamp, comprising:
- a glass bulb having an expanded portion and sealing portions;
- conductive elements sealed at said sealing portions of said glass bulb;
- and
- a pair of electrodes disposed opposite the other and each electrode being connected to one of said conductive elements,
- wherein an angle θ1 between a tangent along the inner surface of said expanded portion at a position away from an origin of one of said sealing portions along the length of each of said electrodes and the direction along the length of each of said electrodes is at least about 40°, and
- wherein an inert gas is contained in said high pressure discharge lamp at a pressure of at least 6 kPa.
Dependencies are inferred from the claim text.