Abstract: Provided is a battery unit including a housing, an internal plate attached to an interior of the housing, to separate an interior of the housing into an upper space and a lower space, a battery pack attached to a lower surface of the internal plate, and disposed in the lower space, and a fixing unit for fixing the battery pack to the lower surface of the internal plate.

Abstract: A battery unit comprises a battery pack, and a storage case storing the battery pack, the storage case includes a bottom wall on which the battery pack is mounted, the battery pack includes a bottom plate located between a battery assembly and the bottom wall when the battery pack is stored in the storage case, the bottom plate abutting on the bottom wall, the bottom plate includes a fitting protrusion protruding in a direction away from the battery assembly, and the bottom wall includes a bottom wall side fixing groove in which the fitting protrusion is fitted, in a position corresponding to the fitting protrusion.

Abstract: There is provided an optical fiber module including a reel having a flange on one side of both sides thereof, a first optical fiber being wound around the reel, a first adhesive being applied to a roll of the first optical fiber so that lines of the first optical fiber are fixed to each other and the roll of the first optical fiber is fixed to the flange of the reel, and a first sheet member being fixed to the roll of the first optical fiber with the first adhesive.

Abstract: There is provided an optical fiber module including a reel having a flange on one side of both sides thereof, a first optical fiber being wound around the reel, a first adhesive being applied to a roll of the first optical fiber so that lines of the first optical fiber are fixed to each other and the roll of the first optical fiber is fixed to the flange of the reel, and a first sheet member being fixed to the roll of the first optical fiber with the first adhesive.

Abstract: An electronic device is provided that includes a first component generating heat, a second component to be heated, a heating part configured to heat the second component, and a case containing the first component, the second component, and the heating part. The second component is heated with the heating part and the heat generated by the first component.

Abstract: An electronic device is provided that includes a first component generating heat, a second component to be heated, a heating part configured to heat the second component, and a case containing the first component, the second component, and the heating part. The second component is heated with the heating part and the heat generated by the first component.

Abstract: An optical receiver unit has an optical receiver module which includes an opto-electric converter housed in a metal container, a printed-circuit board having power, signal and ground terminals connected to the opto-electric converter, a casing body which includes a board receptacle and a module receptacle, respectively for accommodating the printed-circuit board and the optical receiver module, and a cover for covering the casing body. The casing body and the cover are both molded out of synthetic resin and have respective, first and second metallized internal surfaces. The cover covers the casing body so that the second metallized internal surface of the cover contacts the first metallized internal surface of the casing body. The ground line is connected to the metal container of the optical receiver module.

Abstract: According to the present invention, a fixing method by soldering is provided which attains, upon fixing to a substrate a cylindrical optical part which includes a lens, a photo-semiconductor device having a light emitting portion or a light receiving portion located substantially at a focus position of the lens, and terminals connected to the photo-semiconductor device, mechanical fixation of the cylindrical optical part to the substrate and electric connection of the terminals to the substrate at a time. According to another aspect of the present invention, a method of collectively fixing an optical part and an electric part on a substrate by soldering is provided. A heating block is divided into a portion made of a substance having a high coefficient of thermal conductivity and another portion made of another substance having a low coefficient of thermal conductivity.