Abstract: The present invention is to provide hollow particles with a low degree of agglomeration and having a high roundness, and a process for producing them. Hollow particles comprising a silicon compound, having an average particle size of from 5 to 65 nm and an average roundness of at least 0.90, and having a shell comprising the silicon compound and having a thickness of from 1 to 20 nm. Further, a method for producing hollow particles, which comprises adding sulfuric acid to a liquid containing spherical organic polymer-silicon compound composite particles having a core comprising an organic polymer and a shell comprising a silicon compound in a medium containing at least 95 mass % of water, followed by heating to carbonize the organic polymer thereby to convert it to a carbide, and subjecting the carbide to decomposition using a liquid oxidizing agent other than sulfuric acid.

Abstract: A connector includes a shell provided as a cylindrical shape having an opened front side; a first insulator arranged in the shell; a second insulator arranged in the shell to be parallel to the first insulator; a first contact provided to be arranged in the first insulator; a second contact provided to be arranged in the second insulator; and a partition section arranged in the shell in a state of projecting from an outside of the shell to an inside of the shell so as to partition a hollow in the shell to a first region in which the first insulator exists and a second region in which the second insulator exists as viewed from the front side of the shell, the partition section being provided to be movable to the outside of the shell.

Abstract: Disclosed are: an environmentally friendly red light-emitting semiconductor element which operates at low voltage, while having sufficient luminous efficiency and sufficient luminous intensity; and a method for manufacturing the same. Specifically disclosed is a method for manufacturing a red light-emitting semiconductor element, wherein an active layer is formed between a p-type layer and an n-type layer in a sequence of the formation steps of the p-type layer and the n-type layer, said active layer being obtained by adding Eu or Pr into GaN, InN, AlN or a mixed crystal thereof by substituting Ga, In or Al with Eu or Pr, using an organic metal vapor phase deposition method under specific temperature conditions in a site wherein light having a wavelength of 618-623 nm can be emitted. Also specifically disclosed is a red light-emitting semiconductor element which is manufactured by the method for manufacturing a red light-emitting semiconductor element.

Abstract: An image pickup lens includes, in order from an object side thereof: a first lens in a meniscus shape having a positive refractive power and including a convex surface facing the object side; a second lens having a negative refractive power and including a concave surface facing an image side of the image pickup lens; a third lens in a meniscus shape having a positive refractive power and including a convex surface facing the image side; and a fourth lens having a negative refractive power and including a concave surface facing the image side, where at least one surface of the fourth lens is in an aspheric shape. The image pickup lens satisfies a predetermined condition relating to a composite focal length of the first lens and the second lens, and a focal length of a total system of the image pickup lens.

Abstract: A high expansion ratio internal combustion engine includes: a variable compression ratio mechanism that varies a mechanical compression ratio of the internal combustion engine; and a variable valve train in which some valve(s) of a plurality of intake valves is phase-variable and the remaining valve(s) is phase-fixed, the variable valve train being configured such that a working angle of the phase-variable intake valve is larger than a working angle of the phase-fixed intake valve, wherein a valve-open timing of the phase-variable intake valve is retarded after a valve-open timing of the phase-fixed intake valve when the internal combustion engine is under low-load operating state.

Abstract: A fluorescent material comprising: a ?-Sialon expressed by the general formula Si6-ZAlZOZN8-Z as a host material; and Eu dissolved in solid solution as a luminescence center, is a powder which, when measured by the laser diffraction scattering method, gives particle diameter distribution in which cumulative 10% diameter (D10) falls within the 7 ?m to 20 ?m range and 90% diameter (D90) within the 50 ?m to 90 ?m range, and can be used as a fluorescent material low in luminescence intensity degradation ideal for illuminators. This fluorescent material can be produced by subjecting a raw powder, which is obtained by mixing a silicon nitride powder, aluminum nitride powder, and aluminum-containing or Eu-containing compound as required, to heating at 1850° C. to 2050° C. for 9 hours or longer in a nitrogen or nonoxidizing atmosphere.

Abstract: The present invention provides methods of forming multi-layered patterned coating films comprising the steps of (1) applying a first colored base coating composition to a substrate, (2) applying a second colored base coating composition over the uncured coating film of the first colored base coating composition in such a manner that the first colored base coating film is partially exposed, the second colored base coating composition being able to form a coating film of different color and/or visual texture from that of the first colored base coating composition, and having, 30 seconds after application, 30 to 60 mass % of the solids content of the base coating composition, and (3) applying a top clear coating composition over the cured or uncured first and second colored base coating compositions, and curing the uncured composition(s).

Abstract: An organic polymer-silicon compound composite particle comprising (a) a core composed of an organic polymer particle containing polyvinyl acetate as a principal component and (b) a shell containing a silicon compound, an average particle size of the organic polymer-silicon compound composite particle being 5 to 150 nm.

Abstract: An internal combustion engine wherein a variable compression ratio mechanism which can change the mechanical compression ratio and a detection sensor for detecting the mechanical compression ratio are provided and wherein the mechanical compression ratio is controlled based on the mechanical compression ratio detected by the detection sensor. When a signal line of the detection sensor breaks, the mechanical compression ratio is lowered to the minimum mechanical compression ratio.

Abstract: It is an object of the present invention to provide a plasma display panel with an improved panel structure for improving a discharge time-lag and, more particularly, to provide a plasma display panel with a new protective film structure, the plasma display panel having uniformed panel properties suitable for mass production with a high yield.

Abstract: An image pickup lens includes: an aperture stop; a first lens having a positive power and including a convex surface facing an object side; a second lens having a negative power and including a concave surface facing an image side; a third lens in a meniscus shape having a positive power and including a convex surface facing the image side; and a fourth lens in a meniscus shape having a negative power and including a convex surface facing the object side. The image pickup lens satisfies predetermined conditions relating to a composite focal length of the first through third lenses, a length of an air space between the third lens and the fourth lens along the optical axis, and a curvature radius of a surface of the second lens facing the image side.

Abstract: An image pickup lens, comprises sequentially from an object side: an aperture stop, a first lens being a positive meniscus lens which has a convex surface at the object side and a concave surface at an image side opposite to the object side, and a second lens having a concave surface at the object side and an image side surface whose radius of curvature on an paraxial region is infinite or a negative value, wherein the first lens is the second lens and the image side surface of the second lens includes an aspheric surface to make a positive power strong toward a lens peripheral region, and wherein the image pickup lens is made to satisfy the following conditional formulas. 1.55<n1<1.80??(1) 0.4<D3/f<0.6??(2) 40.0<?2<90.

Abstract: An image pickup lens includes: a first lens block with a positive power and a second lens block. The first lens block includes a first lens substrate, a lens portion 1a with a positive power, formed on an object-side surface of the first lens substrate, and a lens portion 1b with a negative power, formed on an image-side surface of the first lens substrate. The object-side surface of the lens portion 1a is a convex surface, and an image-side surface of the lens portion 1b is a concave surface. The second lens block includes a second lens substrate, and a lens portion 2a with a negative power, formed on an object-side surface of the second lens substrate. The object-side surface of the lens portion 2a is a concave surface. The image pickup lens satisfies the predetermined conditional expressions.

Abstract: An image pickup lens, comprises sequentially from an object side: an aperture stop, a first lens being a positive meniscus lens which has a convex surface at the object side and a concave surface at an image side opposite to the object side, and a second lens having a concave surface at the object side and an image side surface whose radius of curvature on an paraxial region is infinite or a negative value, wherein the first lens is the second lens and the image side surface of the second lens includes an aspheric surface to make a positive power strong toward a lens peripheral region, and wherein the image pickup lens is made to satisfy the following conditional formulas: 1.55<n1<1.80??(1) 0.4<D3/f<0.6??(2) 40.0<?2<90.0??(3).

Abstract: An interface connector makes parts to be fitted by insertion hold the state where a receptacle and a plug are fitted, and removes the plug easily from the receptacle when load is applied to the plug from a direction other than the insertion direction. In the interface connector (10), the plug (100) has an inserting projection part (114) in which a plurality of plug terminals (120) are disposed in upper and lower faces (114b and 114c).

Abstract: An image pickup lens includes: a first lens block with a positive power and a second lens block. The first lens block includes a first lens substrate, a lens portion 1a with a positive power, formed on an object-side surface of the first lens substrate, and a lens portion 1b with a negative power, formed on an image-side surface of the first lens substrate. The object-side surface of the lens portion 1a is a convex surface, and an image-side surface of the lens portion 1b is a concave surface. The second lens block includes a second lens substrate, and a lens portion 2a with a negative power, formed on an object-side surface of the second lens substrate. The object-side surface of the lens portion 2a is a concave surface. The image pickup lens satisfies the predetermined conditional expressions.

Abstract: Disclosed is a connector, comprising: a shell provided as a cylindrical shape having an opened front side; a first insulator arranged in the shell; a second insulator arranged in the shell to be parallel to the first insulator; a first contact provided to be arranged in the first insulator; a second contact provided to be arranged in the second insulator; and a partition section arranged in the shell in a state of projecting from an outside of the shell to an inside of the shell so as to partition a hollow in the shell to a first region in which the first insulator exists and a second region in which the second insulator exists as viewed from the front side of the shell, the partition section being provided to be movable to the outside of the shell.

Abstract: An image pickup lens, comprises sequentially from an object side: an aperture stop, a first lens being a positive meniscus lens which has a convex surface at the object side and a concave surface at an image side opposite to the object side, and a second lens having a concave surface at the object side and an image side surface whose radius of curvature on an paraxial region is infinite or a negative value, wherein the first lens is the second lens and the image side surface of the second lens includes an aspheric surface to make a positive power strong toward a lens peripheral region, and wherein the image pickup lens is made to satisfy the following conditional formulas. 1.55<n1<1.80??(1) 0.4<D3/f<0.6??(2) 40.0<?2<90.

Abstract: To provide an acrylic rubber composition having an excellent heat resistance, especially an excellent balance between the residual ratio of the tensile strength and the residual ratio of the elongation after heat aging, when formed into a vulcanized product, and a hose article, a sealing article and a rubber vibration insulator using the acrylic rubber composition. An acrylic rubber composition containing an acrylic rubber obtainable by copolymerizing 100 parts by mass of an alkyl acrylate with from 10 to 100 parts by mass of an alkyl methacrylate and from 0.5 to 4 parts by mass of a crosslinkable monomer. Here, the alkyl methacrylate is preferably at least one compound selected from the group consisting of methyl methacrylate, ethyl methacrylate and n-butyl methacrylate, and the alkyl acrylate is preferably at least one compound selected from the group consisting of methyl acrylate, ethyl acrylate and n-butyl acrylate.

Abstract: A production method, comprising a step of synthesizing silicon particle-containing silicon oxide particles by performing a gas phase reaction of monosilane gas and oxidizing gas for oxidizing the monosilane gas and a step of removing the silicon oxide with hydrofluoric acid after holding the silicon oxide particle powder in an inert atmosphere at 800-1400°, provides high-purity silicon nanoparticles which are highly practical as material powder for high-performance light-emitting elements and electronic parts in an industrial scale.