Electrode for high pressure discharge lamp, high pressure discharge lamp, and method for manufacturing electrode for high pressure discharge lamptechnical field
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United States of America Patent
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Apr 17, 2012
Grant Date -
May 26, 2011
app pub date -
Jun 9, 2009
filing date -
Jul 25, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Provided is an electrode for a high pressure discharge lamp, which prevents spring-back of an electrode coil, and which has high productivity and high accuracy in positioning the coil. The electrode for the high pressure discharge lamp includes: an electrode core bar (30); and a coil (35) mounted on the electrode core bar, and is configured as follows. The electrode core bar (30) includes: a small-diameter section (31) on a power supply side; and a large-diameter section (32) on a leading end side. The large-diameter section (32) has: a large-diameter portion (32a) on the small-diameter section side; a small-diameter portion (32b) having a smaller outer diameter than the large-diameter portion, the small-diameter portion forming a step (s) with the large-diameter portion therebetween; and a leading end portion (32c). The coil (35) covers a portion between the step (s) and the leading end portion.
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