Abstract: An optical system (10) for image pickup includes a first refractive optical system (Si) disposed on an object side with respect to an aperture stop (St) and a second refractive optical system (S2) disposed on an image plane side with respect to the aperture stop. The first refractive optical system includes, in order from the object side (11), a first lens group (G1) with positive refractive power, a second lens group (G2) with positive refractive power, and a third lens group (G3) with negative refractive power. The second refractive optical system includes, in order from the object side (11), a fourth lens group (G4) with positive refractive power, a fifth lens group (G5) with positive refractive power, and a sixth lens group (G6) with negative refractive power. When focusing from infinity to a short distance, the second lens group and the fourth lens group move toward the object side.

Abstract: An optical system (10) for image pickup includes a first refractive optical system (Si) disposed on an object side with respect to an aperture stop (St) and a second refractive optical system (S2) disposed on an image plane side with respect to the aperture stop. The first refractive optical system includes, in order from the object side (11), a first lens group (G1) with positive refractive power, a second lens group (G2) with positive refractive power, and a third lens group (G3) with negative refractive power. The second refractive optical system includes, in order from the object side (11), a fourth lens group (G4) with positive refractive power, a fifth lens group (G5) with positive refractive power, and a sixth lens group (G6) with negative refractive power. When focusing from infinity to a short distance, the second lens group and the fourth lens group move toward the object side.

Abstract: Bearing 11 has base material 110 and coating layer 111. Base material 110 contains crank shaft 13 on an inner circumferential surface side. The inner circumferential surface of base material 110 is coated with coating layer 111. The inner circumferential surface side of base material 110 is coated with a resin with a thickness t, the resin is dried, and thereafter surface treatment is carried out such that multiple grooves C are provided on the surface of the resin so as to intersect with the direction of crank shaft 13, whereby coating layer 111 is formed. Peak portions B formed between adjacent grooves C come into contact with the outer circumferential surface of crank shaft 13 to support crank shaft 13. With bearing 11, the thickness of peak portions B at the center in the direction of the crank shaft 13 differs from the thickness of peak portions B at the end.

Abstract: Bearing 11 has base material 110 and coating layer 111. Base material 110 contains crank shaft 13 on an inner circumferential surface side. The inner circumferential surface of base material 110 is coated with coating layer 111. The inner circumferential surface side of base material 110 is coated with resin with thickness t, the resin is dried, and thereafter surface treatment is carried out such that multiple grooves C are provided on the surface of the resin so as to intersect with the direction of crank shaft 13, whereby coating layer 111 is formed. Peak portions B formed between adjacent grooves C come into contact with the outer circumferential surface of crank shaft 13 to support crank shaft 13. With bearing 11, the thickness of peak portions B at the center in the direction of the crank shaft 13 differs from the thickness of peak portions B at the end.

Abstract: A sliding material based on graphite-added resin containing 5 to 60% by weight of graphite particles having an average particle diameter of from 5 to 50 ?m, and a degree of graphitization of 0.6 or more, with the balance being one or more of polyimide resin and polyamide-imide resin, and further, the number of the graphite particles having a minimum diameter/maximum diameter ratio (hereinafter referred to as “particle ratio”) of 0.5 or more amounts to 50% or more of the total number of the graphite particles observed in a photograph of an optional cross section of the sliding material based on graphite-added resin.

Abstract: A scroll compressor which can be mounted in an automobile has a slide bearing resulting from baking onto a back metal a sliding layer of 5-60 wt % graphite having an average diameter of 5-50 ?m and a graphitization degree of at least 0.6, the remainder containing a polyimide resin and/or a polyamide-imide resin. The form of the graphite has: (a) an average shape factor (YAVE) as defined of 1-4 for the particles excluding the minute particles that are no greater than 0.5 times the average diameter, and there being at least 70% by number of particles having a shape factor (Y) in the range of 1-1.5; or (b) graphite particles having a particle ratio of at least 0.5 being at least 50% of the total by number.

Abstract: An optical system (1) includes: a first lens system (10) that emits light (51a) of a visible light band incident from a light modulating device (60) side toward a projection side; and an optical device (30) that separates proximate light (52b), which is adjacent to the visible light band and is light of a non-visible light band that is incident on the first lens system (10) from the projection side, from an optical path (41) of the first lens system (10) and outputs toward an image pickup device (70) side.

Abstract: A PTFE-based sliding material, wherein the porous sintered layer on the surface of backing metal is impregnated with baked PTFE, with one or both of the solid lubricant and wear-resistant additive together with fibrous PTFE forming an entangled fibrous PTFE structure, is used for a bearing of air-conditioner. Resistance of the bearing for local wear is required. Such wear resistance is to be enhanced. Carbides of an oligomer or polymer containing a hydrophilic group formed during baking are incorporated in the entangled structure of fibrous PTFE.

Abstract: [Problem] To exchange the roller bearing that has been used in a scroll compressor mounted in an automobile with a m slide bearing. To provide a slide bearing having a performance that is at least equivalent to that of a roller bearing. [Solution] The slide bearing results from baking onto a back metal a sliding layer of 5-60 wt % graphite having an average diameter of 5-50 ?m and a graphitization degree of at least 0.6, the remainder comprising a polyimide resin and/or a polyamide-imide resin. The form of the graphite has: (a) an average shape factor (YAVE) as defined of 1-4 for the particles excluding the minute particles that are no greater than 0.5 times the average diameter, and there being at least 70% by number of particles having a shape factor (Y) in the range of 1-1.5; or (b) graphite particles having a particle ratio of at least 0.5 being at least 50% of the total by number.

Abstract: [Task] Seizure resistance of sliding material based on graphite-added resin is improved. [Means for Solution] A sliding material based on graphite-added resin has composition (1); graphite: average particle diameter of from 5 to 50 ?m, a degree of graphitization of 0.6 or more, the number of graphite particles having a minimum diameter/maximum diameter ratio of 0.5 or more amounts to 50% or more of the total number of the graphite particles observed in a photograph of an optional cross section, content 5 to 60% by weight, as well as composition (2). balance of polyimide resin and/or polyamide-imide resin.

Abstract: (Task) A PTFE-based sliding material, wherein the porous sintered layer on the surface of backing metal is impregnated with baked PTFE, and occasionally, with one or both of the solid lubricant and wear-resistant additive together with fibrous PTFE, is used for a bearing of air-conditioner. Resistance of the bearing for local wear is required. Such wear resistance is to be enhanced. (Solution Means) Carbides of oligomer or polymer 2 are incorporated in the entangled structure of fibrous PTFE 1.

Abstract: A zoom lens system that has two lens groups with respectively negative and positive refractive powers in that order from a display medium, such as a screen, side is provided. The first lens group and the second lens group respectively include at least one aspherical surface. An air distance dw between the first lens group and the second lens group at the wide angle end, an air distance dt between the first lens group and the second lens group at the telephoto end, a combined focal length f1 of the first lens group, a combined focal length f2 of the second lens group, and the combined focal length fw of the zoom lens system at the wide angle end satisfy the following conditions: 0.05<dt/dw<0.1; dt<2.5 mm; 1.3<|f1/fw|<1.6; 1.1<|f2/f1|<1.4.

Abstract: A zoom lens system that has two lens groups with respectively negative and positive refractive powers in that order from a display medium, such as a screen, side is provided. The first lens group and the second lens group respectively include at least one aspherical surface. An air distance dw between the first lens group and the second lens group at the wide angle end, an air distance dt between the first lens group and the second lens group at the telephoto end, a combined focal length f1 of the first lens group, a combined focal length f2 of the second lens group, and the combined focal length fw of the zoom lens system at the wide angle end satisfy the following conditions: 0.05<dt/dw<0.1; dt<2.5 mm; 1.3<|f1/fw|<1.6; 1.1<|f2/f1|<1.4.

Abstract: A projection zoom lens that is suited to projector with a DMD is provided. The projection zoom lens projects, onto a screen, projection light from the DMD and comprises, in order from a screen side, a first lens group with negative refractive power and a second lens group with positive refractive power. The second lens group includes, from the DMD side, a final lens that is a positive lens, a pre-final lens that is a negative biconcave lens positioned next to the final lens, and a stop, and both surfaces of the pre-final lens are aspherical. Using the projection zoom lens, it is possible to realize the compact projector that can project bright images with high resolution that makes full use of the characteristics of the DMD.

Abstract: A zoom lens system that includes lens groups G1 to G5 that have negative, positive, positive, negative and positive refractive power respectively in the order from a screen side is provided. The fourth lens group G4 includes a cemented lens made up of a negative lens that is concave on the screen side and a convex lens. The zoom lens system satisfies conditions below 1.15<f2/fw<2.0 50<?vd4<70 where fw is a combined focal length of the zoom lens system at a wide-angle end, f2 is a combined focal length of the second lens group, and ?vd4 is a difference in the respective Abbe numbers vd of lenses composing the cemented lens in the fourth lens group G4.

Abstract: A zoom lens system that includes lens groups G1 to G5 that have negative, positive, positive, negative and positive refractive power respectively in the order from a screen side is provided. The fourth lens group G4 includes a cemented lens made up of a negative lens that is concave on the screen side and a convex lens. The zoom lens system satisfies conditions below 1.15<f2/fw<2.0 50<?vd4<70 where fw is a combined focal length of the zoom lens system at a wide-angle end, f2 is a combined focal length of the second lens group, and ?vd4 is a difference in the respective Abbe numbers vd of lenses composing the cemented lens in the fourth lens group G4.

Abstract: A projection zoom lens that is suited to projector with a DMD is provided. The projection zoom lens projects, onto a screen, projection light from the DMD and comprises, in order from a screen side, a first lens group with negative refractive power and a second lens group with positive refractive power. The second lens group includes, from the DMD side, a final lens that is a positive lens, a pre-final lens that is a negative biconcave lens positioned next to the final lens, and a stop, and both surfaces of the pre-final lens are aspherical. Using the projection zoom lens, it is possible to realize the compact projector that can project bright images with high resolution that makes full use of the characteristics of the DMD.

Abstract: A projection zoom lens system according to the present invention has a substantially telecentric incidence side and comprises a plurality of lens groups for behaving differently between a wide-angle end and a telephoto end, wherein at least one of two surfaces of a lens included in a first lens group located closest to a screen side has an aspheric surface. Since the lens closest to the screen has the largest diameter and the density of light rays becomes smallest among the lenses, it is possible to design the aspheric surface for correcting properly the light rays and reduce the correcting loads of the other lens groups constituting the projection zoom lens system so as to provide the compact and high performance zoom lens system.

Abstract: A projection zoom lens system according to the present invention has a substantially telecentric incidence side and comprises a plurality of lens groups for behaving differently between a wide-angle end and a telephoto end, wherein at least one of two surfaces of a lens included in a first lens group located closest to a screen side has an aspheric surface. Since the lens closest to the screen has the largest diameter and the density of light rays becomes smallest among the lenses, it is possible to design the aspheric surface for correcting properly the light rays and reduce the correcting loads of the other lens groups constituting the projection zoom lens system so as to provide the compact and high performance zoom lens system.

Abstract: Disclosed is a pressure-sensitive adhesive tape comprising: a sheet backing composed of polybutadiene foam having a substantially closed cell foam structure; and a layer of pressure-sensitive adhesive composition provided on a surface of the sheet backing. The pressure-sensitive adhesive composition in the present invention comprises: (A) an acrylic copolymer prepared from a mixuture composing: (i) at least one acrylic ester monomer having an alkyl radical containing, on average, 4 to 12 carbon atoms as an alcohol residue; and (ii) polymerizable unsaturated carboxylic acid monomer; (B) a polymer having a hydrolyzable silicon-containing radical; and (C) a polyfunctional isocyanate compound. The adhesive composition of the present invention needs no silanol condensation catalyst.