Harison Toshiba Lighting Corporation

Syouhei Maeda

Toshiya Suzuki

Hiroyuki Doi

Ichiro Yokozeki

Manabu Kika

Takaaki Tanaka

Takayuki Ogasawara

Akiko Kuraya

Yoshito Kato

A dielectric barrier discharge lamp () has an inside electrode () in a tube axis direction within the airtight container (), which has ultraviolet transmission properties and a long tube shape, and an outside electrode () having a semicircular shape arranged outside of the airtight container () in close contact with it. Besides, an excimer-forming gas is sealed in the airtight container (). AC voltage supplied from the power source () is converted into DC voltage through a converter () and outputted. A high-frequency wave is generated by an inverter () based on the DC voltage supplied from the converter (), and a dielectric barrier discharge is induced in the dielectric barrier discharge lamp () to irradiate ultraviolet rays. The converter () is configured by connecting in series the outputs of DC power sources (), (). Optimum luminous efficiency of a dielectric barrier discharge lamp having different specifications is also realized by adjusting the number of DC power sources.

Dielectric barrier discharge lamp lighting device

An inductor for performing a chopper operation by turning on or off a first switching element MOSFET Qand obtaining an increased voltage is arranged on the secondary side of a transformerand on the basis of the turn ratio of the transformer, a high voltage at the time of stable lighting can be obtained from a DC power sourceat a low voltage Vin. Further, when the on-duties of the first and second switching elements MOSFET Qand Qconstituting an inverter circuit are made almost similar, the timings of application of the power to both ends of a lampcan be made similar, so that the life span of the lamp can be improved.

Lighting device for discharge lamp

An induction heating roller device that keeps leakage current within specifications and prevents the occurrence of erroneous operations caused by common mode noise. The induction heating roller device includes an induction coil, a grounded heating roller magnetically coupled to the induction coil and heated by electro-magnetic induction. A power factor improving capacitor is connected in parallel to and near the induction coil and has a grounded intermediate point. A high-frequency power source biases the induction coil. The leakage current produced by distributed capacitance between the induction coil and the heating roller is returned to the high-frequency power source via the power factor improving capacitor. Thus, the leakage current does not flow out of the induction heating roller device.

Induction heating roller device for use in image forming apparatus

Growing community of inventors

Yokosuka, Japan

Syouhei Maeda