Toshiba Lighting & Technology Corporation

Takahito Kashiwagi

Masazumi Ishida

Shigemi Oku

Seiko Kawashima

Hisashi Honda

Kozo Uemura

Toshihiko Ishigami

Seiji Ashida

Mikio Matsuda

Satoshi Iwasawa

Akira Ito

Sadao Sakaguchi

Masahiro Fujita

Naoya Matsumoto

Hiroyuki Ogata

Daisuke Takayama

Makoto Hashimoato

Yoshiko Takahashi

Sadao Sakuguchi

According to one embodiment, a light-emitting circuit including a substrate, a plurality of light-emitting portions, and a luminous intensity distribution control member is provided. A plurality of the light-emitting portions are arranged apart from each other on the substrate. A plurality of the light-emitting portions each have a plurality of light-emitting elements and a color mixing unit. A plurality of the light-emitting elements radiate light. The color mixing unit combines the lights sealing a plurality of the light-emitting elements and radiated from a plurality of the light-emitting elements. The luminous intensity distribution control member includes a plurality of lenses provided corresponding to a plurality of the light-emitting portions, respectively, provided so that respective lights radiated from a plurality of the light-emitting portions enter a plurality of the lenses respectively, and configured to control the luminous intensity distribution of the light-emitting portions.

Light-emitting circuit and luminaire

A mercury-free high-pressure discharge lamp includes a light-transmissive airtight envelope enclosing therein a discharge space, and a pair of electrodes sealed inside the light-transmissive airtight envelope and facing the discharge space, and the primary halide includes at least thulium bromide having an innumerable emission spectrum primarily around the peak of a luminosity curve and alkali metal halide, and the accessory halide contains one or more metal halides mostly selected from a group of Magnesium (Mg), Iron (Fe), Cobalt (Co), Chromium (Cr), Zinc (Zn), Nickel (Ni), Manganese (Mn), Aluminum (Al), Antimony (Sb), Bismuth (Bi), Beryllium (Be), Rhenium (Re), Gallium (Ga), Titanium (Ti), Zirconium (Zr), and Hafnium (Hf) which primarily contribute to fix lamp voltage.

Mercury-free high-pressure discharge lamp and luminaire using the same

A high-pressure discharge lamp which includes a translucent ceramic discharge vessel having a swollen portion defining a discharge space and a pair of cylindrical portions formed in and communicating with the swollen portion and extending from the swollen portion in the opposite directions with each other. The high-pressure discharge lamp also includes metal tubes each having a outer diameter D and fit with its one end on the cylindrical portion, a pair of fusible metal plugs each plugged in the outer end of the metal tube, the fusible metal plug sealing the discharge vessel by being fused to the inner surface of the metal tube for a specified height T from the outer end of the metal plug, a pair of electrode systems each supported its one end to the fusible metal plug and facing the interior of swollen portion with its other end, and ionizing filling filled in the discharge vessel The ratio T/D of the height T concerning the fusible metal plug and the diameter D satisfies the following equation 0.40&lE;T/D&lE;0.95.

High pressure discharge lamp and luminaire

High pressure discharge lamp, high pressure discharge lamp lighting apparatus and luminaire therefor

A glow starter comprises a discharge vessel, filled with a filling including a rare gas, substantially transmitting ultraviolet rays of about 300 nm or less. A pair of electrodes, which are arranged in the discharge vessel, is adapted and arranged to touch each other by being heated by a glow discharge. The glow starter may be used for a high pressure discharge lamp, a high pressure discharge lamp apparatus, or a lighting fixture.

Glow starter for a high pressure discharge lamp

Growing community of inventors

Kanagawa-ken, Japan

Takahito Kashiwagi