Title:
LIGHTING DEVICE FOR ELECTRIC DISCHARGE LAMP
Document Type and Number:
Japanese Patent JP3386875
Kind Code:
B2
Abstract:
PURPOSE: To provide a broad dimming range without deteriorating the life characteristic of a hot-cathode electric discharge lamp.
CONSTITUTION: Lighting and preheating inverters, 4, 10, respectively, are connected to respective power circuits, each of which includes a feedback loop 3. Part of a voltage outputted from the lighting power circuit is fed back to the preheating inverter 10. Therefore, the restricting of a lamp current results in an increase in preliminary heat and so filmanet temperature does not drop even with the lamp current greatly restricted, and a stable discharge can be achieved.
Inventors:
Kenji Kawabata
Soichiro Ogawa
Soichiro Ogawa
Application Number:
JP191594A
Publication Date:
March 17, 2003
Filing Date:
January 13, 1994
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H05B41/24; H05B41/392; (IPC1-7): H05B41/392; H05B41/24
Domestic Patent References:
| JP745389A | ||||
| JP521189A | ||||
| JP5258876A |
Attorney, Agent or Firm:
Yasuo Sakuta (1 outside)
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