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:
Mar. 16, 2004
Filed:
Jun. 27, 2002
Shunsuke Kakisaka, Ibaraki, JP;
Shigefumi Oda, Takatsuki, JP;
Yoshiharu Nishiura, Otsu, JP;
Masanori Higashi, Takatsuki, JP;
Hiroshi Enami, Nishinomiya, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A safety metal halide lamp with a high luminous efficiency and a long lamp life is provided. The metal halide lamp includes an arc tube made of light-transmissive ceramic, in which a pair of electrodes is provided and cerium iodide (CeI ) and sodium iodide (NaI) are enclosed as a light-emitting substance, wherein a molar composition rate NaI/CeI of the light-emitting substance is specified within a range of 3.8 to 10, inclusive, and a wall load on the arc tube ranges from 13 to 23 W/cm , inclusive, and on a series of X, Y coordinates, where X denotes a value of a lamp watt (W) and Y denotes a value of Le/&phgr;i, where Le and &phgr;i denote a distance between the pair of electrodes and an internal diameter of the arc tube, respectively, values of the Le/&phgr;i and the lamp watt are specified to be within a range surrounded by lines passing through the points (200, 0.75), (300,0.80), (400, 0.85), (700, 1.00), (1,000, 1.15), (1,000, 2.10), (700, 2.00), (400, 1.90), (300, 1.80), and (200, 1.70) in this stated order.