Electrode used for discharge lamp, high pressure discharge lamp, lamp unit, and projection image display apparatus

摘要

The present invention aims to prevent breakage of a sealing part and an electrode of a high pressure discharge lamp, and provides an electrode 100 used for a discharge lamp and having a rod-shaped part 101, one end of the rod-shaped part 101 to be sealed by a sealing part of an arc tube of the discharge lamp, the other end of the rod-shaped part 101 to be in a discharge space in the arc tube, wherein the rod-shaped part 101 has a rough surface that is composed of a plurality of types of crystal grains each having a different surface condition due to differences in crystal orientation.

主权项

1. An electrode used for a discharge lamp and having a rod-shaped part, one end of the rod-shaped part to be sealed by a sealing part of an arc tube of the discharge lamp, the other end of the rod-shaped part to be in a discharge space in the arc tube, wherein
the rod-shaped part, sealed in the sealing part of the arc tube, has a rough surface that is composed of a plurality of types of crystal grains each having a different crystal orientation, that has been etched, and the crystal orientation of each type of crystal grain differs depending on whether and to what degree the type of crystal grain has been etched, and at least a crystal grain having a [001] crystal orientation included in the plurality of types of crystal grains has been etched.