Abstract: A photocurable resin composition including: (A) a urethane (meth)acrylate oligomer having a polyoxyalkylene structure, (B) a (meth)acrylic polymer, (C) a (meth)acrylic monomer, and (D) a photopolymerization initiator, wherein the component (A) is produced using monomer components including (a1) a polyoxyalkylene polyol, (a2) a polyisocyanate, and (a3) a hydroxyl group-containing mono(meth)acrylate compound, a relationship N (=n1/n2) between the total mass n1 of the monomer components and the total equivalent weight n2 of acryloyl groups within the all monomer components is 4,000 or greater, and the component (A) is substantially free of unreacted isocyanate groups.

Abstract: A transfer roller is provide that less cause faulty image which is used in electrophotographic process such as copiers and laser-beam printers, in particular, used on the inner side of an intermediate transfer belt of a full-color image forming apparatus. It is a transfer roller which has a shaft and provided on the periphery thereof at least two conductive foamed rubber layers; the layers having an outermost layer which has a foamed rubber mean cell size of from 10 ?m or more to less than 100 ?m and an inner layer which has a foamed rubber mean cell size of from 100 ?m or more to 500 ?m or less; and, as measured in an environment of 23° C./55% RH, the roller having a resistance Rx of from 5.6 or more to 7.0 or less in Log Rx and the inner layer having a resistance Ry of from 5.0 or more to 7.0 or less in Log Ry.

Abstract: Disclosed is a urethane (meth)acrylate oligomer which is obtained by reacting at least one polyoxyalkylene polyol (A), at least one monool (B1) soluble in the component (A) and/or at least one silane coupling agent (B2) reactive with an isocyanate group, at least one polyisocyanate (C) and at least one hydroxylated mono(meth)acrylate compound (D) at a ratio at which the equivalent weights of hydroxy groups, active hydrogen groups and isocyanate groups in the respective components satisfy the following formulae (1)-(3). The urethane (meth)acrylate oligomer does not substantially contain an unreacted isocyanate group. B(active hydrogen)+D(OH)=C(NCO)?A(OH) (1) 1.05?C(NCO)/A(OH)?2 (2) {C(NCO)?2A(OH)+2 m}×0.35?D(OH)?{C(NCO)?2A(OH)+2 m}×0.

Abstract: A method and apparatus for measuring a refracting power of an optical system to be inspected. A beam source generates a luminous flux which passes through the optical system to be inspected. A rotating plate intermittently blocks the beam after passing through the optical system to be inspected. A beam receiving element receives the beam passing through the optical system to be inspected and intermittently blocked by the rotating plate, and outputs a beam reception signal based on the received beam. A rotational position detector detects a rotational position of the rotating plate and outputs a rotational plate detection signal based on the detected rotational position of the rotating plate. Further, a calculating means calculates the refracting power of the optical system to be inspected based on a change quantity from the detected rotational plate detection signal to the detected beam reception signal.