Abstract: A stress relaxation type adhesive is formed such that an epoxy-based base adhesive is formed with an epoxy compound having two or more allyl groups as functional groups, as a main agent, using an amine-based curing agent having a bisphenol A type resin backbone, and at least one of an ethylene-acrylic copolymer and an ethylene-propylene copolymer each having an average particle diameter of 10 ?m or less is contained as a stress relaxation agent in a range of 20 wt % or less with respect to the base adhesive.

Abstract: To achieve high positioning accuracy in an optical member fixing structure configured to bond an optical member, such as a lens, and a bonding object to each other with an adhesive layer, an optical member fixing structure in which a metal layer having a yield stress equal to or less than a curing shrinkage stress or a thermal stress of an adhesive forming an adhesive layer is formed on a bonding surface between at least one of an optical member or a bonding object and the adhesive layer to have a thickness of from 0.3% to 10% of a thickness of the adhesive layer after curing thereof.

Abstract: To achieve high positioning accuracy in an optical member fixing structure configured to bond an optical member, such as a lens, and a bonding object to each other with an adhesive layer, an optical member fixing structure in which a metal layer having a yield stress equal to or less than a curing shrinkage stress or a thermal stress of an adhesive forming an adhesive layer is formed on a bonding surface between at least one of an optical member or a bonding object and the adhesive layer to have a thickness of from 0.3% to 10% of a thickness of the adhesive layer after curing thereof.

Abstract: A wavelength-multiplexing optical communication module includes: a substrate; a plurality of light sources on the substrate; a plurality of joint materials separately disposed on the substrate at positions respectively corresponding to the plurality of light sources; and a plurality of optical components fixed on the substrate by means of the plurality of joint materials respectively, wherein the substrate includes a plurality of forming portions which respectively form peripheries of the plurality of joint materials into shapes of circles or regular polygons having an even number of vertices.

Abstract: A wavelength-multiplexing optical communication module includes: a substrate; a plurality of light sources on the substrate; a plurality of joint materials separately disposed on the substrate at positions respectively corresponding to the plurality of light sources; and a plurality of optical components fixed on the substrate by means of the plurality of joint materials respectively, wherein the substrate includes a plurality of forming portions which respectively form peripheries of the plurality of joint materials into shapes of circles or regular polygons having an even number of vertices.

Abstract: A method of cleaning a mount substrate comprising the step of: preparing a cleaning solution and cleaning the mount substrate by using the cleaning solution. The cleaning solution is a chemical solution produced by providing organic amine as a content in a hydrocarbon-based solvent containing a ketone or an aromatic and by adding unsaturated carboxylic acid anhydride or carboxylic anhydride to this solvent.

Abstract: A method of manufacturing a wavelength multiplexing optical communication module which includes a plurality of light emitting elements, a plurality of optical lenses adjusting wavefronts of emergent lights from the plurality of light emitting elements, and a multiplexer combining the lights adjusted by the plurality of optical lenses, includes: applying a resin on a carrier so as to have a shape with a curvature symmetric about a rotation axis; and bonding a lower surface of the optical lens to the carrier with the resin, wherein a recess having a curvature is formed at a center of the lower surface of the optical lens.

Abstract: A method of cleaning a mount substrate comprising the step of: preparing a cleaning solution and cleaning the mount substrate by using the cleaning solution. The cleaning solution is a chemical solution produced by providing organic amine as a content in a hydrocarbon-based solvent containing a ketone or an aromatic and by adding unsaturated carboxylic acid anhydride or carboxylic anhydride to this solvent.

Abstract: A method of cleaning a mount substrate comprising the step of: preparing a cleaning solution and cleaning the mount substrate by using the cleaning solution. The cleaning solution is a chemical solution produced by providing organic amine as a content in a hydrocarbon-based solvent containing a ketone or an aromatic and by adding unsaturated carboxylic acid anhydride or carboxylic anhydride to this solvent.