Title:
高圧放電ランプ、高圧放電ランプ点灯装置および照明装置
Document Type and Number:
Japanese Patent JP4135050
Kind Code:
B2
Abstract:
The invention provides a high-intensity discharge lamp, a high-intensity discharge lamp lighting system and a lighting system using the high-intensity discharge lamp having a low starting voltage. The high-intensity discharge lamp comprises a lighting source bulb (IB) provided with a light-transmissive ceramic enclosure (1) defining a pair of small-diameter cylinders (1b) communicating with the enclosure (1) at both ends thereof, a pair of electrodes (2A,2B) and discharge agent (5), a metallic coil (CO1,CO2) which is wound on the outside surface of at least one small-diameter cylinder (1b) and coupled to the end of the other electrode (2A,2B) to have the same potential as this electrode, a jacket-bulb (OB) which hermetically accommodates the lighting-source bulb (IB) and the metallic coil (CO1,CO2) therein, and a pair of outer lead terminals (OCT1,OCT2) which are coupled to the pair of electrodes (2A,2B) and hermetically led outside the jacket-bulb (OB). The metallic coil (CO1,CO2) is preferably wound for four turns or more on the small-diameter cylinder (1b), and placed its one end near the boundary to the enclosure (1) of the light-transmissive ceramic discharge enclosure (1), and the winding pitch of the metallic coil (CO1,CO2) resides in the range of 100% to 500%. Further, the length (L2) of the metallic coil (CO1,CO2) is 0.3 to 1.0 times the length of the small-diameter cylinder (1b). Furthermore, the end of it which is opposite to the enclosure (1) is coupled to have the same potential as the other electrode (CO2,CO1).
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Inventors:
Honda Kuji
Sadao Sakaguchi
Seiji Ashida
Kawazuru Shigehisa
Kazuhiro Miyakawa
Sadao Sakaguchi
Seiji Ashida
Kawazuru Shigehisa
Kazuhiro Miyakawa
Application Number:
JP34953899A
Publication Date:
August 20, 2008
Filing Date:
December 08, 1999
Export Citation:
Assignee:
Toshiba Lighting & Technology Corporation
International Classes:
G02B5/02; C08J5/18; H01J61/54; G02B5/30; G02F1/13; H01J61/02; H01J61/073; H01J61/12; H01J61/26; H01J61/30; H01J61/34; H01J61/56; H01J61/82
Domestic Patent References:
| JP11509680A | ||||
| JP10294085A | ||||
| JP11513189A | ||||
| JP11135075A | ||||
| JP57138770A | ||||
| JP51113376A | ||||
| JP55006728A |
Attorney, Agent or Firm:
Shinji Nogi
Kumagai Masatoshi
Kumagai Masatoshi