Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Masanori Higashi

Takashi Yamamoto

Naotaka Hashimoto

Shinya Kawagoe

Yoshiharu Nishiura

Shunsuke Kakisaka

Hiroshi Enami

Rie Tonomori

Hiroshi Nohara

Toshiyasu Kojima

Shigefumi Oda

Kazuo Takeda

Takashi Maniwa

Shiki Nakayama

Mikio Miura

Tatsuo Nishimoto

Yoshiharu Nishihura

An object of the present invention is to provide an illumination apparatus which includes an illumination fixture having an open-type reflector and a metal halide lamp, and can suppress a decrease in intensity and occurrence of glare. The illumination apparatus includes a metal halide lamp and an illumination fixture. The metal halide lamp includes an arc tube which has therein a pair of electrodes, an inner tube which houses the arc tube and has a pinch seal part at one end, and an outer tube which houses the inner tube and has a base at one end. The illumination fixture includes a reflector having a concave reflecting surface, a socket, and an attachment. In the inner tube, a diffusing part which diffuses light emitted from the arc tube is formed in an area closer to a lower end of the inner tube than a center between the pair of electrodes.

Illumination apparatus and metal vapor discharge lamp

With regard to a metal vapor discharge lamp with a triple tube structure including a discharge tube, an inner tube, and an outer tube, misalignment of axes of the inner tube and the outer tube is prevented. The metal vapor discharge lamp () is composed of a discharge tube () having a pair of electrodes therein, an inner tube () having a pinch-sealed part () at an end thereof and hermitically housing the discharge tube therein, and an outer tube () housing the inner tube therein, and a base (). In a clearance between the inner tube and the outer tube, there disposed a restrain member () for restraining movement of the inner tube relative to the outer tube in a direction orthogonal to an axis of the metal vapor discharge lamp.

Metal vapor discharge lamp with a restrain member for inner tube

A metal halide lamp has an arc tube including an arc tube container made of an oxide-based translucent ceramic material. The arc tube is filled with cerium halide as a luminescent material and a halide of a rare earth element that is more reactive with the ceramic material than is the cerium halide. Accordingly, a reaction between the oxide-based translucent ceramic material and the halide of a rare earth element is accelerated while a reaction between the oxide-based translucent ceramic material and the cerium halide is suppressed. This suppresses a decrease of the cerium halide that serves for light emission, and also reduces changes in the lamp color temperature. Thereby, during aging of the lamp, the flux maintenance factor and color temperature are improved. Therefore, the indoor-outdoor metal halide lamp provides a white light source color that has high-wattage, high luminous efficiency, and a long service life.

Metal halide lamp

A metal vapor discharge lamp including an arc tubethat includes a containerand power transmission membersand. The container, made of translucent ceramic, is divided into a main tube portionand narrow tube portionsandextending out from both ends of the main tube portion. The power transmission membersandrespectively include electrode pinsandmade of tungsten. Coilsandmade of tungsten are respectively wound around ends of electrode pinsand, which are respectively joined with electrode supporting membersandmade of conductive cermet. Electrode length Lis set to (0.041P+0.5) mm to (0.041P+8.0) mm, 'P' representing a lamp power in watts. Alternatively, a narrow tube portion length Lis set to (0.032P+3.5) mm to (0.032P+8.0) mm inclusive.

Metal vapor discharge lamp and lighting apparatus capable of stable maintenance of characteristics

To provide a high-efficiency and long-life high intensity discharge lamp that is obtained by a configuration in which a neon gas or a neon-based gaseous mixture is filled as a starting-assistance rare gas for an alumina ceramic arc tube, and a filling pressure is set to 13 kPa or more. The high intensity discharge lamp is provided with the alumina ceramic arc tube having a discharge arc tube, alumina ceramic narrow tubes formed at both end portions of the discharge arc tube, electrodes and power feeders, the electrodes and the power feeders being arranged to form spaces in the narrow tubes. The discharge arc tube is filled with the neon gas or the neon-based gaseous mixture as the starting-assistance rare gas at a filling pressure of 13 kPa or more.

High intensity discharge lamp and high intensity discharge lamp system using the same

A metal halide lamp has an arc tube including an envelope as an arc tube container made of an oxide-based translucent ceramic material, and the arc tube is filled with luminescent materials comprising at least a cerium halide, a sodium halide, a thallium halide and an indium halide. An amount of the cerium halide is in a range from 20 wt % to 69.0 wt %, an amount of the sodium halide is in a range from 30 wt % to 79.0 wt %, and a total amount of the thallium halide and the indium halide is in a range from 1.0 wt % to 20 wt % with respect to the entire metal halides. Accordingly, the arc discharge is spread, bending of the arc discharge toward the arc tube wall is suppressed, and thus, the metal halide lamp has improved luminescent efficiency, where lowering of the flux maintenance factor is suppressed even after a long-time use, and hues of the luminescent colors are corrected.

A safety metal halide lamp with a high luminous efficiency and a long lamp life is provided. The metal halide lamp includes an arc tube made of light-transmissive ceramic, in which a pair of electrodes is provided and cerium iodide (CeI ) and sodium iodide (NaI) are enclosed as a light-emitting substance, wherein a molar composition rate NaI/CeI of the light-emitting substance is specified within a range of 3.8 to 10, inclusive, and a wall load on the arc tube ranges from 13 to 23 W/cm , inclusive, and on a series of X, Y coordinates, where X denotes a value of a lamp watt (W) and Y denotes a value of Le/&phgr;i, where Le and &phgr;i denote a distance between the pair of electrodes and an internal diameter of the arc tube, respectively, values of the Le/&phgr;i and the lamp watt are specified to be within a range surrounded by lines passing through the points (200, 0.75), (300,0.80), (400, 0.85), (700, 1.00), (1,000, 1.15), (1,000, 2.10), (700, 2.00), (400, 1.90), (300, 1.80), and (200, 1.70) in this stated order.

A high-pressure discharge lamp having an arc tube that includes a main tube part and a pair of capillary tube parts is provided. The main tube part includes a pair of electrodes and a metal halide enclosed, and the pair of capillary tube parts is arranged at the of the main tube part. The pair of capillary tube parts is sealed by means of a seal member to a different one of the feeders, and supplies electricity to each of the electrodes. At least one of the feeders includes a first conductive member that is resistant to halides and sealed to the capillary tube part, and a second conductive member that is connected to the first conductive member outside the capillary tube part and fixed at an outer end of the capillary tube part by means of the seal member.

High-pressure discharge lamp and arc tube with long operating lifetime and high impact resistance

A discharge tube ( ) made of transparent ceramics includes a main tube ( ) and slender tubes provided on both sides thereof. In one of the slender tubes, a main electrode lead-in member that is connected to a main electrode ( ) is inserted and sealed. In the other two-hole slender tube, a main electrode lead-in member that is connected to a main electrode ( ) and an auxiliary electrode lead-in member that is connected to an auxiliary electrode ( ) are inserted and sealed so as to be isolated electrically from each other. With such a structure, it is possible to achieve highly efficient and stable lifetime characteristics and suppress changes in characteristics during lifetime caused by leaks during an operation and reaction between a sealing material and an enclosed material inside the discharge tube. In addition, it is possible to obtain a high-pressure metal vapor discharge lamp that has stable lamp starting characteristics and allows a free design of the discharge tube.

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Kyoto, Japan

Masanori Higashi