Matsushita Electric Industrial Co., Ltd.

Matushita Electric Industrial Co., Ltd.

Yoji Tashiro

Kenji Itaya

Satoshi Kominami

Koji Miyazaki

Kenichiro Takahashi

Tetsuya Tahara

A dimmable self-ballasted fluorescent lamp includes a fluorescent lamp, a ballast and a lamp base that are formed as one unit. The ballast includes a preheating current supply circuit for supplying a preheating current to the fluorescent lamp; an inverter circuit portion for supplying a high frequency AC voltage to the fluorescent lamp; and a control circuit portion for controlling a driving frequency of the inverter circuit portion. The ballast is provided with an output current limiting element for limiting an output current from the preheating current supply circuit.

Dimmable self-ballasted fluorescent lamp and discharge lamp operating apparatus

A fluorescent lamp includes an end cap,and a fluorescent tube,that has electrode seals,and,at its ends. The end cap,is made of synthetic resin and is attached to the fluorescent tube,by silicon resin,. The end cap,includes round cavities,and,for holding the electrode seals,and,and thermal protection element holders,and,for holding thermal protection elements,and,adjacent to the electrode seals,and,. Pillars,are provided between the thermal protection element holders,and,and the round cavities,and,to support the thermal protection elements,and,. Through holes,are provided between the round cavities,and,and pillars

Fluorescent lamp with thermal protection element manufacturing method for the fluorescent lamp and a lighting apparatus using the same

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Osaka, Japan

Yoji Tashiro