Patent ID: 8648531
Filing Date: 2014-02-11
Classification: H01J

Abstract:
1. A high pressure discharge lamp, comprising: a sealing portion that comprises a glass portion and a sealing metal piece, wherein a surface of the sealing metal piece includes a plurality of elongated grooves formed thereinto and extending generally parallel to one another, each one of the plurality of elongated grooves extending in a lengthwise direction defining a length thereof, in a depthwise direction commencing at the surface of the sealing metal piece and terminating at a bottom to define an elongated groove depth thereof and in a widthwise direction defining a width thereof, with the length being at least twice as large as the width, wherein each one of the elongated grooves includes a plurality of spaced-apart transverse grooves positioned therein and commencing at the bottom of each one of the plurality of elongated grooves and extending into the sealing metal piece to a transverse groove depth, across the widthwise direction to define transverse groove length and in the lengthwise direction to define a transverse groove width, the plurality of transverse grooves forming a ladder-like configuration at the bottom of and inside each one of the plurality of elongated grooves.