Toshiba Lighting & Technology Corporation

Kabushiki Kaisha Toshiba

Katsusuke Uchino

Shigehisa Kawatsuru

Takashi Nakamura

Kenji Sugiyama

Keiichi Shimizu

Takayuki Ono

Hiroshi Kubota

Hitoshi Kawano

Masahiko Kamata

Takuro Hiramatsu

Toshiyuki Hiraoka

Masatoshi Kumagai

Naoko Iwai

Shinji Inukai

Kazuyoshi Okamura

Akihiro Inoue

Naoki Sugishita

Satoshi Watanabe

Hajime Osaki

Yasuki Mori

Kazuiki Uchida

Makoto Kawagoe

Akira Itoh

Masanao Hieda

Tomoko Ishiwata

Mitsuhiro Matsuda

Satoshi Iwasawa

Fumie Iwata

Kazuo Takita

Yoko Noguchi

Akira Ito

Hidenori Nishigaki

Junko Takahashi

Kimihito Sato

Masao Hori

Hirochika Shiohama

Koji Sato

Mitsuho Kotabe

Yuki Harada

A lighting circuit according to embodiments includes: a self-hold element connected in series to an AC power source that generates power for lighting an illumination load, together with the illumination load, the self-hold element being configured to control supply of the power provided by the AC power source to the illumination load by the self-hold element being turned on/off; a noise prevention circuit connected in parallel to the self-hold element; and a damping circuit configured to connect a damping resistance to the noise prevention circuit parallely only for a predetermined period from turning-on of the self-hold element, thereby preventing the self-hold element from being repeatedly turned on/off during a period in which the self-hold element is on under normal conditions, due to a transient during power supply.

Lighting circuit and illumination device

Both ends of a lamp body are mounted on sockets of an apparatus body and a feeding unit configured to feed power to LEDs is provided on the back side facing the apparatus body of the lamp body.

Tube lamp and luminaire

Plural luminaires are installed in a lighting space surrounded by a wall part. A sensor equipment detects existence or nonexistence of a person in the lighting space. If existence of a person in the lighting space is detected, the sensor equipment detects a direction of the person. The sensor equipment detects a distance between the wall part positioned in front of the direction of the person and the person. A lighting control unit selectively switches between a first control for performing lighting control of the luminaires to illuminate the wall part positioned in front of the direction of the person if the detected distance is a specified distance or less, and a second control for performing lighting control of the luminaires to reduce brightness at a place as the place becomes farther from a position of the person if the detected distance is larger than the specified distance.

Lighting control system and lighting control method

An electrodeless high intensity discharge lamp has a light transmissive ceramic arc tube for containing a discharge sustaining medium and a hollow tube member. An excitation coil for causing an arc discharge is situated about the arc tube. The ceramic arc tube includes a first portion for developing the arc discharge therein and a second portion protruding outwardly from the first portion. The hollow tube member is so disposed in the second portion that a space is provided between the inner wall surface of the second portion and the outer wall surface of the hollow tube member. The space is in communication with the interior of the first portion for allowing the medium to be condensed and retained during the lamp operation.

Electrodeless lamp having a narrow gap between a sealed tube and the arc

The invention provides a high-pressure discharge lamp incorporating an outer envelope storing a pair of electric terminals a plurality of arc tubes which are respectively stored in this outer envelope and electrically connected in parallel, and a plurality of ignition aids available for assisting operating of these arc tubes, where these ignition aids are provided for each of these arc tubes and contain potentials different from each other. In addition, the invention also provides a lighting system for operating the high-pressure discharge lamp. The lighting system comprises the first and second power supply lines which respectively provides mutual connection between a pair of terminals of the high-pressure discharge lamp, a ballast which is at least provided for either of the first and second power supply lines, a power switch which is provided for either the first or the second power supply line, a pulse generating means which generates either the positive or the negative ignition pulses to be superimposed on AC power voltage output from an AC power supply source, and a control circuit which alters polarity of the ignition pulses output from the pulse generator.

High-pressure discharge lamp and lighting method

This invention provides an improved layer coated on the outer surface of the envelope of high intensity discharge lamps, halogen lamps and so on. The overcoated layer is provided for preventing glass pieces of the envelope from scattering when the glass envelope is broken. Therefore the improved and strengthened layer comprises a fluorocarbon polymer containing metal oxide grains dispersed therein. The metal oxide grains are dispersed in the fluorocarbon polymer since the overcoated layer is heated at more than 200.degree. C. Further, for the purpose of strengthening the overcoated layer, the overcoated layer has an even density of the metal oxide grains in the fluorocarbon polymer. The even density of the metal oxide grains in the fluorocarbon polymer is obtained only by this invention of the coating method that includes a electrostatic coating step.

Lamp having a glass envelope with fluorocarbon polymer layer

Growing community of inventors

Yokosuka, Japan

Katsusuke Uchino