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US 8,648,531 B2Granted
High pressure discharge lamp and method of manufacturing high pressure discharge lamp
AssigneeUshio Denki Kabushiki Kaisha
InventorsToshio Yokota, Yukio Yasuda, Hiroyuki Daido, Hiromitsu Kiriyama, Hajime Okada, Masayuki Suzuki, Izuru Daito
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Abstract
A high pressure discharge lamp has a sealing portion that is made of glass and a sealing metal piece. In a method of manufacturing the high pressure discharge lamp, the sealing metal piece is irradiated with laser beam whose pulse width is 1×10−9 seconds or less, so as to carry out a surface treatment of the sealing metal piece. The sealing metal piece may have a groove that is 120 to 600 nm in depth and 450 to 1,200 nm in width.
Claims14
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.
A high pressure discharge lamp, comprising:
- a sealing portion that comprises a glass portion and a sealing metal piece,
- wherein 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, 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 a widthwise direction defining a width thereof, with the length being larger than 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 and
- the depth of each one of the elongated grooves is at least approximately 120 nm.
1 more element
Dependencies are inferred from the claim text.