Abstract: A lens unit can inhibit deterioration in optical characteristics caused due to deformation of resin lens. The lens unit includes: a metal lens barrel; a plurality of lenses arranged on the inner peripheral side of the lens barrel in the axial direction thereof; and an annular intermediate ring disposed between the lenses adjacent to each other in the axial direction. The intermediate ring is made of metal and has a convex portion formed toward the image side or the object side. The lens is made of resin, having a concave portion fitted with the convex portion. A gap formed between the outer peripheral surface of the lens and the inner peripheral surface of the lens barrel is larger than a gap formed between the outer peripheral surface of the intermediate ring and the inner peripheral surface of the lens barrel.

Abstract: A lens unit can inhibit deterioration in optical characteristics caused due to deformation of resin lens. The lens unit includes: a metal lens barrel; a plurality of lenses arranged on the inner peripheral side of the lens barrel in the axial direction thereof; and an annular intermediate ring disposed between the lenses adjacent to each other in the axial direction. The intermediate ring is made of metal and has a convex portion formed toward the image side or the object side. The lens is made of resin, having a concave portion fitted with the convex portion. A gap formed between the outer peripheral surface of the lens and the inner peripheral surface of the lens barrel is larger than a gap formed between the outer peripheral surface of the intermediate ring and the inner peripheral surface of the lens barrel.

Abstract: The content distribution system of the invention changes over the content distribution destination between terminals which have different content receiving formats. The terminals comprise means for requesting, while viewing content from a broadcasting station, changeover of distribution of this content to another terminal. The broadcasting station comprises means for changing over the content distribution destination on the basis of the aforesaid request. The content distribution system of the invention also comprises means for deciding on the distribution format of content in accordance with the type of aforesaid other terminal, which corresponds to the destination to which content distribution is to be changed over to by the changeover means.

Abstract: Provided is a composite material for sliding members which comprises a titanium carbide matrix and graphite particles excellent in crystallinity which are uniformly dispersed in the titanium carbide matrix. This composite material has self-lubricity and high wear resistance together with the excellent properties of titanium carbide such as high strength, high hardness, high melting point, low specific gravity and high electrical conductivity.

Abstract: A sintered non-oxide ceramic composite high in density, high-temperature strength and toughness and having optionally and widely changeable electrical conductivity is obtained by compacting and sintering a mixed powder comprising 5-95% by weight of at least one compound selected from titanium carbide, nitride and carbonitride, 0.1-5% by weight (based on silicon carbide) of boron or boron compound in terms of boron, 0.1-5% by weight (based on silicon carbide) of carbon or carbon compound in terms of residual carbon and the balance of substantially silicon carbide.