Ngk Insulators, Inc.

Norikazu Niimi

Michio Asai

Go Suzuki

Tsutomu Kondo

Keiichiro Watanabe

Takashi Ota

The inventive luminous vessel has strong bonding and improved adhesion of the current through conductor provided in the luminous container to a sealing member or the like. A luminous vessel has a luminous container, a solid current through conductor made of a metal or a cermet and a sintered body of a molded body containing at least metal powder fixed to the outside of the current through conductor.

Luminous vessels

An object of the present invention is to lower the sintering temperature required for a sintered body of yttrium-aluminum garnet, to improve the corrosion resistance of the sintered body and to prevent the reduction of the transmittance thereof. A sintered body of yttrium-aluminum garnet is produced from a source compound for yttrium and a source compound for aluminum using aluminum nitride as a sintering aid. It maybe considered that aluminum nitride reacts with alumina and yttria to generate liquid phase and to reduce the sintering temperature during the sintering process.

Sintered bodies of yttrium-aluminum garnet, a method of producing the same and sintering aid therefor

An object of the invention is to reduce the adverse effects due to a difference of thermal expansion between a conductive sealing member and a light-emitting vessel and to provide a reliable high pressure mercury lamp, even when the lamp is operated at a high pressure. The lamp has a light-emitting vesselof quartz and having end portions, an electrode membercontained in the vessel, and a conductive sealing memberA. The sealing memberA is fixed in the end portion and connected to the electrode member. The conductive member is composed of a sintered body made from silica granules each having a coating of a metal or a metal compound. The sintered body has a conductive network structure made of the metal and having a content of the metal of not higher than 20 volume percent.

High pressure mercury lamps and sealing members therefor

A joined body is provided, including a first member having a first joining face and sapphire exposed at the first joining face and a second member having a second joining face and sapphire or polycrystalline alumina exposed at the second joining face. The first member and second member are joined by providing a raw material for the joining material between the first and second members and heat treating the raw material at a temperature of 1730&#xb0; C. or lower.

Joined bodies, luminous containers and assemblies for high pressure discharge lamps

The present invention provides a joined body having a first member, a second memberand a joining materialinterposed between the first and second members. The joining material has a porous bone structurewith open pores and made of a sintered product of metal powder and impregnated phaseimpregnated into the open pores. The impregnated phaseincludes an oxynitride glass. The joined body has improved resistance against fatigue and fracture, even when the body is subjected to thermal cycles between high and room temperatures and held at a high temperature over a long period of time.

Joined bodies, high pressure discharge lamps and assemblies therefor

The present invention provides a joined body having a first member, a second member and a joining material interposed between the first and second members. The joining material has a porous bone structure with open pores and made of a sintered product of metal powder and impregnated phase impregnated into the open pores. The impregnated phase has polycrystalline substance made from a metal oxide and at least one of a nitride and an oxynitride. The joined body has improved resistance against fatigue and fracture, even when the body is subjected to repeated thermal cycles between high and room temperatures.

Joined bodies, assemblies for high pressure discharge lamps and high pressure discharge lamps

A metal-made seamless pipe is provided, containing at least one metal selected from the group consisting of metals each having a melting point of 1,600&#xb0; C. or more, and has a porosity of 0.3 to 25%. The porosity is defined as a ratio of the open pores present at the outer surface of the pipe to the total surface area of the outer surface of the pipe. The open pores do not include through-pores perforating to the inner surface of the pipe. A process for producing such a metal-made seamless pipe is also provided. The metal-made seamless pipe is low in processability but can be produced having a small thickness and a small inner diameter, having superior mechanical strength and gastightness, and can be suitably used as a sealing member of a translucent vessel of a high-pressure discharge lamp.

Metal-made seamless pipe and process for production thereof

A high pressure discharge lamp including a ceramic discharge tube defining an inner space and having an opening formed within an end portion thereof, an electrode system provided within the inner space, a sealing member including a ceramic or a cermet with a through hole formed therein, at least a part of the sealing member being fixed within the opening of the ceramic discharge tube, and a metal member. A joining portion is interposed between the metal and sealing members, and includes a main phase contacting the metal member and an intermediate ceramic layer contacting the sealing member and existing between the sealing member and the main phase. The main phase includes a porous bone structure with open pores, is made of a sintered product of metal powder, and includes a ceramic phase impregnated into the open pores thereof.

Joined body and high pressure discharge lamp

A joined body is provided, including a joining portion interposed between a first member wade of a metal and a second member, made of a ceramic or a cermet that joins the first and second members. The joining portion includes a main phase contacting the first member and an intermediate glass layer between the second member and the main phase. The main phase is composed of a porous bone structure having open pores and is made of a sintered product of metal powder. A glass phase is impregnated into the open pores in the porous bone structure. Preferably, the glasses of the intermediate glass layer and the impregnated glass phase have substantially the same composition.

Joined bodies, high-pressure discharge lamps and a method for manufacturing the same

A ceramic discharge vessel having end portions and an inner space formed therein is filled with an ionizable light emitting substance and a starter gas. The end portion has an inner wall surface facing an opening formed in the end portion. A hollow portion is formed in the conductive member. The conductive member is inserted into the opening of the end portion of the vessel. A joining layer joins the inner wall surface of the end portion and the outer surface of the conductive member. A recess facing the opening is formed in the end portion, and the recess extends circumferentially with respect to the central axis &ldquo;X&rdquo; of the vessel. When the conductive member is inserted into the opening of the end portion of the vessel and joined, the adherence or residue of joining material onto the end face or inner surface of the conductive member may be prevented.

High pressure discharge lamps, and assemblies and discharge vessels therefor

The invention provides a joined body of a first member made of a metal and a second member made of a ceramic or a cermet. The joined body comprises a joining portion interposed between the first member and the second member for joining the first and second members. The joining portion comprises main phase contacting the first member and an intermediate ceramic layer existing between the second member and the main phase and contacting the second member. The main phase is composed of a porous bone structure having open pores and is made of a sintered product of metal powder, and a ceramic phase impregnated into the open pores in the porous bone structure. The joined structure has resistance to fatigue and fracture, even when the structure is subjected to repeated thermal cycles between a high temperature, for example 1000&deg; C. or higher, and room temperature.

Joined body and a high-pressure discharge lamp

A high pressure discharge lamp A has a light emitting vessel A made of a semitransparent ceramic material and having a pair of end portions each with an opening formed in the end portion and a light emitting portion , a pair of discharge electrodes , and electrode supporting members each supporting the electrode and fixed to the end portion . The vessel A defines an inner space with an ionizable light emitting substance and starter gas filled in the inner space . The electrodes are contained in the inner space . The light emitting portion has a thicker portion and a thinner portion . The thinner portion has a cross sectional area of not smaller than 35 percent and not larger than 80 percent of that of the thicker portion so that the light emitting portion has a brightness center in the thinner portion

High pressure discharge lamps, lighting systems, head lamps for automobiles and light emitting vessels for high pressure discharge lamps

The invention provides a joined body of a first member made of a metal and a second member made of a ceramic or a cermet. The joined body comprises a joining portion interposed between the first member and the second member for joining the first and second members. The joining portion comprises a main phase contacting the first member and an intermediate ceramic layer existing between the second member and the main phase as well as contacting the second member. The main phase is composed of a porous bone structure, having open pores and made of a sintered product of metal powder, and having a ceramic phase impregnated into the open pores of the porous bone structure. The joined structure has fatigue and fracture resistance, even when the structure is subjected to repeated thermal cycles between a high temperature, for example 1000&deg; C. or higher, and room temperature.

Joined body and high-pressure discharge lamp

A light emitting element comprises a housing formed by allowing respective first principal surfaces of a rectangular upper housing member made of glass material and having a recess at a central portion on its first principal surface and a rectangular lower housing member made of glass material and having a recess at a central portion on its first principal surface as well to make contact with each other so that they are thermally glued by pressing under a pressure in a predetermined atmosphere; a cavity formed by the respective recesses in the housing and enclosed with at least one of a gas and a light emitting substance; and two lead wires confronted with each other with the cavity interposed therebetween. Accordingly, it is possible to simultaneously realize the integration and the miniaturization of the electronic tube and present the display expression for information transmission at a high brightness.

Light emitting element with mutually confronting electrodes

The invention provides a joined body of a first member made of a metal and a second member made of a ceramic or a cermet. The joined body comprises a joining portion interposed between the first member and the second member for joining the first and second members. The joining portion comprises main phase contacting the first member and an intermediate ceramic layer existing between the second member and the main phase and contacting the second member. The main phase is composed of a porous bone structure, having open pores and is made of a sintered product of metal powder, and a ceramic phase impregnated into the open pores in the porous bone structure. The joined structure has resistance to fatigue and fracture, even when the structure is subjected to repeated thermal cycles between a high temperature, for example 1000&deg; C. or higher, and room temperature.

Growing community of inventors

Kasugai, Japan

Norikazu Niimi