Abstract: A repeater includes: a pressure-tight casing to be arranged on seabed or in sea; and a feedthrough having a plurality of lead sections each configured to connect a circuit housed in the pressure-tight casing with a cable outside the pressure-tight casing, wherein the plurality of lead sections include at least a power wire and an electric signal wire, and at least two of the plurality of lead sections have a difference in length from each other.

Abstract: An optical transmission device includes: a first cage and a second cage provided in parallel on a top surface of a substrate, into which modules connectable to an optical transmission path are inserted, respectively; a first heat sink including: a first main body arranged along surfaces of the first cage and the second cage at the opposite side to the substrate, and a first plate member rising from a bottom surface of the first main body which faces the substrate, and arranged between the first cage and the second cage.

Abstract: A heat-transfer plate includes a pool portion configured to have a partially-depressed surface and to be loaded with thermally-conductive resin that is in contact with a heating component so as to transfer the heat from the heating component to the heat-transfer plate, a resin-amount check portion configured to have a plurality of depths and to be disposed at a position where the thermally-conductive resin is viewable in a state where the printed circuit board is fixed to the heat-transfer plate, a levee portion configured to be provided between the pool portion and the resin-amount check portion and to suppress flow of the thermally-conductive resin toward the resin-amount check portion, and a flow channel configured to be provided between the pool portion and the resin-amount check portion and to serve as a path through which the thermally-conductive resin flowing into the resin-amount check portion from the pool portion travels.

Abstract: A repeater includes: a pressure-tight casing to be arranged on seabed or in sea; and a feedthrough having a plurality of lead sections each configured to connect a circuit housed in the pressure-tight casing with a cable outside the pressure-tight casing, wherein the plurality of lead sections include at least a power wire and an electric signal wire, and at least two of the plurality of lead sections have a difference in length from each other.

Abstract: An optical transmission device includes: a first cage and a second cage provided in parallel on a top surface of a substrate, into which modules connectable to an optical transmission path are inserted, respectively; a first heat sink including: a first main body arranged along surfaces of the first cage and the second cage at the opposite side to the substrate, and a first plate member rising from a bottom surface of the first main body which faces the substrate, and arranged between the first cage and the second cage.

Abstract: There is provided an underwater apparatus that includes a housing including a certain device, a pair of cable couplings including gimbals through which tail cables extends from the device to the outside of the housing pass, and the pair of cable couplings that connect the tail cables passing through the gimbals to a submarine cable, and a connecting holder configured to include gimbal rings fitted to the gimbals and to connect the pair of cable couplings to the housing via the gimbal rings so that the pair of cable coupling is rotatable relative to the housing, the connecting holder including an opening from which the gimbals are introduced toward the gimbal rings, wherein the connecting holder includes notches provided in an edge of the opening and the notches are formed so that the pair of cable coupling is rotatable relative to the housing.

Abstract: A heat radiation plate includes a depressed portion into which thermally-conductive resin that transfers heat of an electronic component to the heat radiation plate is poured, and a plurality of check portions configured to be provided to the depressed portion and with an upper surface portion and a lower surface portion stepwise at positions lower than an outer edge portion of the depressed portion and higher than a bottom surface portion of the depressed portion so that a liquid level of the thermally-conductive resin is visually checkable, wherein when the thermally-conductive resin is normally filled in the depressed portion, each of the lower surface portions of the plurality of check portions is covered with the thermally-conductive resin and each of the upper surface portions of the plurality of check portions is exposed without being covered with the thermally-conductive resin.

Abstract: A heat-transfer plate includes a pool portion configured to have a partially-depressed surface and to be loaded with thermally-conductive resin that is in contact with a heating component so as to transfer the heat from the heating component to the heat-transfer plate, a resin-amount check portion configured to have a plurality of depths and to be disposed at a position where the thermally-conductive resin is viewable in a state where the printed circuit board is fixed to the heat-transfer plate, a levee portion configured to be provided between the pool portion and the resin-amount check portion and to suppress flow of the thermally-conductive resin toward the resin-amount check portion, and a flow channel configured to be provided between the pool portion and the resin-amount check portion and to serve as a path through which the thermally-conductive resin flowing into the resin-amount check portion from the pool portion travels.