Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2005-04-21
2008-10-14
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S246000
Reexamination Certificate
active
07436130
ABSTRACT:
A cold-cathode tube lighting device uniformly lights a plurality of cold-cathode tubes using a common power source, and maintains the luminance of each cold-cathode tube uniformly in the longitudinal direction thereof at high precision. A first block converts a direct-current voltage to one pair of alternating-voltages. Since leakage impedances of step-up transformers are low, the first block functions as one pair of low-impedance power sources. Each second block is connected to each cold-cathode tube. A ballast inductor stabilizes tube current by resonating with a matching capacitor during lighting of the cold-cathode tube. A combined impedance of the matching capacitor and a peripheral stray capacitance is matched with an impedance of the ballast inductor, for each cold-cathode tube. Since a delay circuit shifts phases of two pulse waves with respect to each other, a phase difference between the alternating-voltages is shifted from 180°.
REFERENCES:
patent: 4508996 (1985-04-01), Clegg et al.
patent: 5959412 (1999-09-01), Ushijima
patent: 6222327 (2001-04-01), Shoji et al.
patent: 6559606 (2003-05-01), Chou et al.
patent: 6661181 (2003-12-01), Shin
patent: 6714111 (2004-03-01), Suzuki
patent: 6864644 (2005-03-01), Kernahan
patent: 6979957 (2005-12-01), Lee et al.
patent: 7034800 (2006-04-01), Nakatsuka et al.
patent: 7038397 (2006-05-01), Komatsu et al.
patent: 2002/0047615 (2002-04-01), Yokozeki et al.
patent: 2004/0095081 (2004-05-01), Kernahan
patent: 2004/0207339 (2004-10-01), Lin et al.
patent: 2004/0232853 (2004-11-01), Hur et al.
patent: 2005/0134192 (2005-06-01), Ellams
patent: 2005/0156534 (2005-07-01), Oh
patent: 2005/0285478 (2005-12-01), Takeda et al.
patent: 2007/0052664 (2007-03-01), Hirakata et al.
patent: 5-90897 (1993-12-01), None
patent: 6-19299 (1994-03-01), None
patent: 6-301034 (1994-10-01), None
patent: 8-122776 (1996-05-01), None
patent: 8-273862 (1996-10-01), None
patent: 8-288086 (1996-11-01), None
patent: 2002-353044 (2002-12-01), None
patent: 2004-119206 (2004-04-01), None
patent: 2004-241136 (2004-08-01), None
patent: 2005-63941 (2005-03-01), None
patent: 02/078403 (2002-10-01), None
patent: 03/056885 (2003-07-01), None
Kawataka Kenji
Komatsu Akeyuki
Miyake Eiji
Le Tung X
Matsushita Electric - Industrial Co., Ltd.
Tran Thuy Vinh
Wenderoth , Lind & Ponack, L.L.P.
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