The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2012
Filed:
Feb. 04, 2010
Hirohisa Ishikawa, Himeji, JP;
Nobuhiro Nagamachi, Himeji, JP;
Toyohiko Kumada, Himeji, JP;
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a high pressure discharge lamp having electrode rods with grooves formed in a part thereof and embedded and sealed in sealing parts of a discharge vessel, breakage of the sealing parts because of the grooves is prevented without impairing the mechanical strength of the electrode rods, in which the grooves are formed, by the high pressure discharge lamp comprising: a discharge vessel having a light emitting part and sealing parts connected to both ends of said light emitting part; and electrodes comprising electrode rods and electrode tip end parts arranged oppositely to each other in the light emitting part, said electrode rods being embedded in a respective one of said sealing parts, and axially directed grooves being formed in at least part of the surface of said electrode rods, wherein a diameter measured at groove bottom parts of the grooves of said electrode rods is larger than a diameter of the electrode rods in a part where no grooves are formed.