Iwasaki Electric Co., Ltd.

Atsushi Ohno

Takayoshi Imanari

Yasuhisa Matsumoto

Toshio Yoshizawa

Kazushi Tominaga

Shinichi Takemasa

Moriyuki Sekine

An LED lamp is equipped with a plurality of light source units each having a mounting board on which a light emitting element is mounted, on a front surface of a substrate, the plurality of light source units are disposed around an axis C of the LED lamp with back surfaces of the respective substrates facing inside, and gaps Gleft from one another, and heat radiation fins that are disposed to be inclined with respect to an axial direction of the axis C are provided on the back surface of the substrate.

Lamp having outwardly orientated light source units and inwardly orientated heat sinks with transversely orientated fins

To prevent bending of an electrode shaft portion by a method which requires minimum increase in production cost, in an electrode mount for a high pressure discharge lamp. A manufacturing method of an electrode mount for the high pressure discharge lamp includes: a process of subjecting the electrode mount to a heat treatment, the electrode mount including an electrode and a metal foil which are welded to each other; and an oxidation process of producing an oxide on a surface of the electrode shaft portion of the electrode by laser irradiation to form an oxidation portion on the surface, wherein a laser irradiation position is determined such that a whole or part of the oxidation portion is included in a sealing portion of the high pressure discharge lamp when the electrode mount is embedded in the sealing portion.

Electrode mount, high pressure discharge lamp using the same, and manufacturing methods of electrode mount and high pressure discharge lamp

A high pressure discharge lamp of the present invention is provided with a light-emitting bulb comprising a light-emitting part and sealing sections; metal foils embedded within the sealing sections; and a pair of electrodes having one end protruding into the light-emitting part and having the other end embedded in the corresponding sealing section and joined to the corresponding metal foil. An embedded length L (mm) of the electrodes that is defined by the length between a light-emitting part side end of the metal foil and the border section between the protruding section and the embedded section of the electrode, and the temperature T (&#xb0; C.) at the joint region of the electrode and the metal foil are set to satisfy 1.8&#x2266;L&#x2266;2.8 and T&#x2266;970.

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Gyoda, Japan

Atsushi Ohno