Abstract: A transmission device includes an input/output unit that inputs or outputs an optical signal, and an optical amplifier that amplifies the optical signal passing through an optical fiber by excitation light. The optical amplifier includes a fiber-bundle set that includes a plurality of fiber bundles each formed by winding the optical fiber, and a plate-shaped heating member that has one surface along which the fiber bundles are arranged, and the fiber bundles have mutually different winding radii and are concentrically arranged on the surface of the plate-shaped heating member.

Abstract: An electronic device includes: a spacing tube including a first conductor of a tubular shape with both end faces forming electrical connection, and a second conductor provided inside the first conductor to be electrically spaced from the first conductor, the second conductor including recess to be engaged with screws in both ends thereof; and a first wiring board and a second wiring board which are attached to opposite ends of the spacing tube by the screws fastened to the recess, respectively, and electrically coupled with each other through the first conductor and the second conductor.

Abstract: An electronic device includes: a spacing tube including a first conductor of a tubular shape with both end faces forming electrical connection, and a second conductor provided inside the first conductor to be electrically spaced from the first conductor, the second conductor including recess to be engaged with screws in both ends thereof; and a first wiring board and a second wiring board which are attached to opposite ends of the spacing tube by the screws fastened to the recess, respectively, and electrically coupled with each other through the first conductor and the second conductor.

Abstract: A torque limiting device includes: a clutch disc clamp plate 17 having a surface area 13 where the surface and the outer area surface of the flywheel press or come in contact with each other, and is provided with an opening 16 at the center middle part of the clutch disc clamp plate 17 so that a concave space 14 is formed between the clutch disc clamp plate 17 and the fly wheel 2 when the clutch disc clamp plate 17 is fastened to the fly wheel 2; a clutch disc 18 fitted in the concave space, and connected to the driven apparatus; a clutch pressing plate 22 fitted between the clutch disc 18 and the fly wheel 2; and, at least one pressing means fitted to and in the flywheel 2 and presses the clutch pressing plate 22 in a surface contact condition.

Abstract: Providing a torque limiting device by which a high torque limitation can be set without spoiling the superior stability and wear-resistance. A torque limiting device, including, but not limited to: a clutch disc clamp plate 17 that has a surface area 13 where the surface and the outer area surface of the flywheel press or come in contact with each other, and is provided with an opening 16 at the center middle part of the clutch disc clamp plate 17 so that a concave space 14 is formed between the clutch disc clamp plate 17 and the fly wheel 2 when the clutch disc clamp plate 17 is fastened to the fly wheel 2; a clutch disc 18 that is fitted in the concave space, and connected to the driven apparatus; a clutch pressing plate 22 that is fitted between the clutch disc 18 and the fly wheel 2; and, at least one pressing means that is fitted to and in the flywheel 2 and presses the clutch pressing plate 22 in a surface contact condition.