Title:
高圧放電灯点灯装置、高圧放電灯の点灯方法及びプロジェクタ
Document Type and Number:
Japanese Patent JP4645994
Kind Code:
B2
Abstract:
A high pressure discharge lamp ballast includes an AC power supply means for supplying a square wave alternating current to a high pressure discharge lamp having a bulb in which first and second electrodes are disposed so as to face each other. In the high pressure discharge lamp ballast, one modulation period (T0) of the square wave alternating current supplied by the AC power supply means comprises a first asymmetrical current period (T1) for melting a protrusion formed at the tip of the first electrode and growing a protrusion formed at the tip of the second electrode, a symmetrical current period (Ts) for conducting current having a positive-negative symmetrical square wave, and a second asymmetrical current period (T2) for growing the first protrusion and melting the second protrusion.
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Inventors:
Yoshio Nishizawa
Shinichi Suzuki
Toru Nagase
Yoshiaki Komatsu
Yuya Yamazaki
Shinichi Suzuki
Toru Nagase
Yoshiaki Komatsu
Yuya Yamazaki
Application Number:
JP2010226122A
Publication Date:
March 09, 2011
Filing Date:
October 06, 2010
Export Citation:
Assignee:
Iwasaki Electric Co., Ltd.
International Classes:
H05B41/24
Domestic Patent References:
| JP2006120654A | ||||
| JP11265796A | ||||
| JP200168277A |
Attorney, Agent or Firm:
Okabe
Masao Okabe
Nobuaki Kato
Asahi Shinmitsu
Masao Okabe
Nobuaki Kato
Asahi Shinmitsu