Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2008-06-17
2008-06-17
Tran, Thuy V. (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S291000, C315S306000, C315SDIG002, C323S905000
Reexamination Certificate
active
07388337
ABSTRACT:
A fluorescent lamp lighting apparatus according to the present invention comprises an initial illuminance correction control circuit which sets a fluorescent lamp to an initial illuminance correction control lighting mode, a switching portion which changes the fluorescent lamp from the initial illuminance correction control lighting mode to an external control dimming mode when a predetermined external dimming signal is detected, and a control portion which gradually dimming so as to achieve a dimming level of a switched mode when switching the initial illuminance correction control lighting mode and the external control dimming mode, and control so as to achieve a dimming level corresponding to a cumulative lighting time of the fluorescent lamp when the changed mode is the initial illuminance correction control lighting mode.
REFERENCES:
patent: 6949885 (2005-09-01), Hamamoto et al.
patent: 7176635 (2007-02-01), Gordin et al.
patent: 2006/0158131 (2006-07-01), Mitsuyasu et al.
patent: 64-89287 (1989-04-01), None
patent: 2001-15276 (2001-01-01), None
Hiraoka Toshiyuki
Ishikita Toru
Iwai Naoko
Kitamura Noriyuki
Nogi Shinji
Alemu Ephrem
DLA Piper (US) LLP
Toshiba Lighting & Technology Corporation
Tran Thuy V.
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