Title:
車輌用放電灯
Document Type and Number:
Japanese Patent JP5112025
Kind Code:
B2
Abstract:
An electric discharge lamp has a ceramic luminous tube 5 and filled with xenon gas, a pair of electrodes 9, 10 held by the ceramic luminous tube, and a glass outer tube 6 accommodating the ceramic luminous tube and the pair of electrodes. The ceramic luminous tube includes a luminous portion 7 emitting light by electric discharge, and a pair of small diameter tube portions 8, 8 respectively connected to both end portions of the luminous portion in a longitudinal direction. Value of P/(r•t) is not less than 4.8 and not more than 32, where P (atm) is pressure of xenon gas filled into the ceramic luminous tube, r (mm) is an inner diameter of the luminous portion of the ceramic luminous tube, and t (mm) is thickness of the luminous portion of the ceramic luminous tube.
Inventors:
Toshiaki Tsuda
Yukio Onoda
Yukio Onoda
Application Number:
JP2007307180A
Publication Date:
January 09, 2013
Filing Date:
November 28, 2007
Export Citation:
Assignee:
Koito Manufacturing Co., Ltd.
International Classes:
H01J61/33; H01J61/16; H01J61/86
Domestic Patent References:
| JP2005533345A | ||||
| JP2004171833A | ||||
| JP2000164171A | ||||
| JP2001313001A |
Attorney, Agent or Firm:
Masanobu Iwata
Hiroshi Suda
Hiroshi Suda