Abstract: A wavelength converter is provided with a light-transmitting substrate and with a thin film that is formed on a surface of the light-transmitting substrate and that contains a phosphor. A sintered body that constitutes the light-transmitting substrate has an average particle size of 5-40 ?m. The light-transmitting substrate contains at least 10-500 ppm by mass of MgO. The principal component of the phosphor is an ?-sialon that is indicated by the general formula (Ca?,Eu?) (Si,Al)12(O,N)16 (provided that 1.5<?+?<2.2, 0<?<0.2, and O/N?0.04).

Abstract: A window material for an ultraviolet light emitting device for emitting an ultraviolet light having a wavelength of 300 nm or less is mounted on at least an ultraviolet light emitting side of the ultraviolet light emitting device. The window material for an ultraviolet light emitting device contains a translucent alumina substrate, and a surface of the window material has an average grain diameter of 6 to 60 ?m.

Abstract: An optical component has a ceramic member and a dichroic film. The ceramic member is provided with a first main surface and a second main surface that is opposed to the first main surface. The ceramic member has translucency. The ceramic member has a plurality of crystal grains that are mutually bonded to one another through grain boundary portions. The dichroic film is formed on the first main surface of the ceramic member.

Abstract: A first inorganic powder molded body and a second inorganic powder molded body are obtained. Each of the bodies contains an inorganic powder, an organic dispersion medium having a reactive functional group and a gelling agent and is solidified by chemical reaction of the organic dispersion medium and the gelling agent. Slurry containing a powder component and an organic dispersion medium is applied to a joint surface of the first inorganic powder molded body. The inorganic powder molded bodies are allowed to abut on each other while interposing the slurry therebetween, and integrated together into a joined body. A sintered body is obtained by sintering the joined body.

Abstract: The present invention relates to a ceramic tube for a high-intensity discharge lamp, comprising a hollow member and a plug member. The hollow member contains a substantially cylindrical body and a closure for closing one end of the body, and the plug member is inserted into an insertion opening formed at the other end of the body. Before the insertion of the plug member, the insertion opening has a tapered portion with a diameter decreasing in the direction from the open end to the inside at least in an area into which the plug member is inserted. After the insertion of the plug member, an outer wall of the plug member is bonded to an inner wall of the insertion opening.

Abstract: A ceramic base plate is divided into a plurality of substrate regions 2 each having corner part 8. A dividing groove 7 is formed between the substrate regions 2 adjacent with each other. The corner part 8 of each of the substrate regions 2 faces a spacing 9B communicated with the dividing groove 7. At least a part of the corner part 8 is arc-shaped. The arc-shaped part of the corner part is tangent to a center line 7a of the dividing groove 7 at a cross point “P” of the spacing 9B with the dividing groove 7. The ceramic base plate is broken along the dividing groove 7 to produce ceramic substrates.

Abstract: A translucent polycrystalline sintered body is mainly composed of an alumina, is suitable for the manufacture of an arc tube for a high-intensity discharge lamp, and has an average grain diameter of 35 to 70 ?m, preferably 50 to 60 ?m. In a case where the sintered body is in a 0.5-mm-thick flat plate shape, the in-line transmittance of the sintered body is 30% or more, preferably 50% or more. In this case, the ratio between maximum and minimum in-line transmittance values is 2:1 to 1:1 in the visible region of 360 to 830 nm. The bending strength of the sintered body is 250 MPa or more, preferably 300 MPa or more.

Abstract: An arc tube includes a light emitting body for light therein and a ceramic tube having a first capillary and a second capillary integral with respective opposite sides of the light emitting body. A first electrode is inserted and sealed in the first capillary, and a second electrode is inserted and sealed in the second capillary. The first electrode is sealed in the first capillary by shrink fitting.

Abstract: A mold includes a gate communicating with the entire perimeter of a cavity serving as a space configured to form a molded article. A self-curable molding material with flowability is fed into the perimeter of the cavity through the gate; hence, the mold has a small number of dead ends compared with the case where, for example, the molding material is fed into the cavity through a part of the cavity, preventing the formation of bubbles left in the cavity. The arrangement of a gate and a vent each making an acute angle results in the spontaneous separation of the molded article in the cavity from solidified material portions in the gate and the vent due to shrinkage on curing.

Abstract: The present invention relates to a ceramic tube for a high-intensity discharge lamp, comprising a hollow member and a plug member. The hollow member contains a substantially cylindrical body and a closure for closing one end of the body, and the plug member is inserted into an insertion opening formed at the other end of the body. Before the insertion of the plug member, the insertion opening has a tapered portion with a diameter decreasing in the direction from the open end to the inside at least in an area into which the plug member is inserted. After the insertion of the plug member, an outer wall of the plug member is bonded to an inner wall of the insertion opening.

Abstract: A translucent polycrystalline sintered body is mainly composed of an alumina, is suitable for the manufacture of an arc tube for a high-intensity discharge lamp, and has an average grain diameter of 35 to 70 ?m, preferably 50 to 60 ?m. In a case where the sintered body is in a 0.5-mm-thick flat plate shape, the in-line transmittance of the sintered body is 30% or more, preferably 50% or more. In this case, the ratio between maximum and minimum in-line transmittance values is 2:1 to 1:1 in the visible region of 360 to 830 nm. The bending strength of the sintered body is 250 MPa or more, preferably 300 MPa or more.

Abstract: A mold includes a gate communicating with the entire perimeter of a cavity serving as a space configured to form a molded article. A self-curable molding material with flowability is fed into the perimeter of the cavity through the gate; hence, the mold has a small number of dead ends compared with the case where, for example, the molding material is fed into the cavity through a part of the cavity, preventing the formation of bubbles left in the cavity. The arrangement of a gate and a bent each making an acute angle results in the spontaneous separation of the molded article in the cavity from solidified material portions in the gate and the vent due to shrinkage on curing.

Abstract: A first inorganic powder molded body 1A and a second inorganic powder molded body 1B are obtained. Each of the bodies contains an inorganic powder, an organic dispersion medium having a reactive functional group and a gelling agent and is solidified by chemical reaction of the organic dispersion medium and the gelling agent. Slurry 5A containing a powder component and an organic dispersion medium is applied to a joint surface 4A of the first inorganic powder molded body 1A. The inorganic powder molded bodies 1A and 1B are allowed to abut on each other while interposing the slurry 5A therebetween, and integrated together into a joined body. A sintered body is obtained by sintering the joined body.

Abstract: The present invention provides a sintered body of a joined body including two or more inorganic powder-molded bodies. The sintered body includes first components corresponding to the two or more inorganic powder-molded bodies in the joined body; and a second component corresponding to a junction in the joined body, and has one or both of the features (a) and (b): (a) the second component has a surface roughness equal to or lower than that of each of the first components; and (b) the second component has, in the vicinity of a width center thereof, a transmittance equal to or higher than that of each of the first components.

Abstract: The invention provides a film of an yttria-alumina complex oxide having a high peel strength with respect to a substrate. A mixed powder of powdery materials of yttria and alumina is sprayed on a substrate to form a sprayed film made of an yttria-alumina complex oxide. Preferably, the powdery material of yttria has a 50 percent mean particle diameter of not smaller than 0.1 ?m and not larger than 100 ?m, and the powdery material of alumina has a 50 percent mean particle diameter of not smaller than 0.1 ?m and not larger than 100 ?m. Preferably, the yttria-alumina complex oxide contains at least a garnet phase, and may further contain a perovskite phase.

Abstract: An electrostatic chuck and a method for manufacturing the same are provided. The electrostatic chuck has a bonded structure comprising a ceramic electrostatic chuck member, a metal member and a bonding layer. The bonding layer has at least a first outermost bonding layer joined to the ceramic electrostatic chuck member, a second outermost bonding layer joined to the metal member, and an intermediate polyimide layer disposed between the first and second outermost bonding layers. Each of the outermost bonding layers are made of a silicone layer or an acrylic.

Abstract: An object of the present invention is to provide a ceramic chuck for mounting a wafer so that the number of particles adhered onto the wafer after chucking can be reduced while maintaining a desired Young's Modulus of the chuck. A ceramic chuck 1 has a surface layer 2 contacting a wafer “W” and a substrate portion 6. The surface layer 2 and substrate portion 6 are produced by co-sintering and the surface layer 2 has a porosity of 1% or higher and 10% or lower and larger than that of the substrate portion 6.

Abstract: A joined structure of a metal terminal and a ceramic member has a joining layer between the terminal and the ceramic member. The joining layer has a metal adhesive layer containing at least indium metal. The invention further provides a joined structure of a metal member and a ceramic member. The metal member has a tip face and a side face. A hollow is formed in the ceramic member. A joining layer is formed between a bottom surface facing the hollow and the tip face of the member, and further formed between a side wall surface facing the hollow and the side face of the member. The joining layer has a metal adhesive layer containing at least indium metal.

Abstract: A joined structure of a metal terminal and a ceramic member has a joining layer between the terminal and the ceramic member. The joining layer has a metal adhesive layer containing at least indium metal. The invention further provides a joined structure of a metal member and a ceramic member. The metal member has a tip face and a side face. A hollow is formed in the ceramic member. A joining layer is formed between a bottom surface facing the hollow and the tip face of the member, and further formed between a side wall surface facing the hollow and the side face of the member. The joining layer has a metal adhesive layer containing at least indium metal.

Abstract: A halogen gas plasma-resistant member to be exposed to a halogen gas plasma, includes a main body of said member, and a corrosion-resistant film formed at least a surface of said main body, wherein a peeling resistance of the corrosive film to said main body is not less than 15 MPa.