Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Mitsutoshi Kimura

Masaharu Baba

Taketo Kamei

Kimio Osada

Yasuhiro Nieda

Masayuki Morita

Motokazu Hayashi

In an operating apparatus of a high-pressure discharge lamp of the invention, power is supplied to a heater provided in a high-pressure discharge lamp from a battery. The battery is charged by a charger which is driven by a power section. The power section is started by an ON operation of a switch which is turned on/off synchronously with the operation of a control switch. The control switch allows power supply from the battery to the heater when it is turned on. Therefore, always while power is supplied to the heater, the battery is being charged by the charger so that the voltage of the battery will not be lowered.

Igniting device for a high-pressure discharge lamp capable of battery

A light detector which indicates decrease in the level of ambient light below a prescribed value. The light detector includes a light indicator for radiating light when the level of ambient light decreases below the prescribed value, a light sensor arranged parallel to the light indicator for receiving actual light including ambient light and light from the light indicator for outputting a detection signal corresponding to a level of actual light, and a control circuit for evading effect of the light from the light indicator for controlling the operation of the light indicator while ambient light is below the prescribed level even though the actual light received by the light sensor increases above the prescribed level.

Light detector having light sensor and light indicator, and control

There is disclosed an operating circuit for an electric discharge lamp in which a first DC operating circuit for starting an electric discharge lamp, a second DC operating circuit for making the electric discharge lamp operative by a voltage near a rated lamp voltage and by a current near a rated lamp current, and a third DC operating circuit for supplying a relatively large current to the electric discharge lamp immediately after the electric discharge lamp is started and for stabilizing the lamp luminous flux in a short time, are connected in parallel. A switching circuit for cutting off the first DC operating circuit after the electric discharge lamp is started is provided at the output terminal of the first DC operating circuit. In addition, reverse current preventing circuits for preventing the currents from reversely flowing from the operating circuits at higher voltages are provided at the output terminals of the second and third DC operating circuits.

Operating circuit for electric discharge lamp

A compact fluorescent lamp having a chassis member, a screw base screwed to the chassis member, a base member secured to the chassis member, a winding envelope having bent part and both ends oriented to the same direction, a ballast surrounded by the winding envelope and a globe member attached to the base member. The ballast is disposed between the bent part and the ends of the winding envelope so as to provide the winding envelope with a desirable coolest wall temperature.

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Yokohama, Japan

Mitsutoshi Kimura