Abstract: The present invention provides an earphone that reduces a contact sound generated when, for example, one moves while wearing the earphone or generated upon contact of a wiring or a substrate (component) with clothing or the human body and a frictional sound when the clothing or the skin of the human body rubs against the wiring or the substrate (component), and suppresses an unpleasant sound that would otherwise be heard from these sounds through the wiring. The earphone is provided with a pair of left and right speakers and a circuit to drive the speakers, and further provided with at least one substrate having a circuit including a communication circuit and/or a cell and a wiring for connecting the left and right speakers together or a wiring for connecting the left and right speakers separately to the substrate, the wiring having elasticity.

Abstract: An object of the present invention is to provide an elastic signal transmission cable having a length of several centimeters to several meters that has a shape deformation tracking ability and enables high-speed signal transmission. The inventive elastic signal transmission cable has an elasticity of 10% or more and transmission loss of 10 dB/m or less in a relaxed state at 250 MHz, and comprises an elastic cylindrical body having an elasticity of 10% or more and a conductor portion containing at least two conductor wires wound in the same direction around the elastic cylindrical body.

Abstract: An object of the present invention is to provide an elastic signal transmission cable having a length of several centimeters to several meters that has a shape deformation tracking ability and enables high-speed signal transmission. The inventive elastic signal transmission cable has an elasticity of 10% or more and transmission loss of 10 dB/m or less in a relaxed state at 250 MHz, and comprises an elastic cylindrical body having an elasticity of 10% or more and a conductor portion containing at least two conductor wires wound in the same direction around the elastic cylindrical body.

Abstract: An object of the present invention is to provide an elastic signal transmission cable having a length of several centimeters to several meters that has a shape deformation tracking ability and enables high-speed signal transmission. The inventive elastic signal transmission cable has an elasticity of 10% or more and transmission loss of 10 dB/m or less in a relaxed state at 250 MHz, and comprises an elastic cylindrical body having an elasticity of 10% or more and a conductor portion containing at least two conductor wires wound in the same direction around the elastic cylindrical body.

Abstract: Disclosed is an extensible optical signal transmission cable having an extensity of 10% or more and an optical transmission loss of less than 20 dB/m when the cable is loosened. The cable comprises an elastic cylinder having the extensity of 10% or more and at least one optical fiber wound around the elastic cylinder. The optical fiber has a bending diameter (R) which is not smaller than the bending limit diameter (Re). The extensible optical signal transmission cable is compliant with shape deformation, can transmit an optical signal when the cable is extended or contracted, and can be used in repetitive extension and contraction.

Abstract: An expandable electric cord having a core portion, a conductor portion and a sheath portion; wherein the core portion is an elastic cylinder having an elastic body and an intermediate layer covering the outer periphery thereof. The conductor portion contains a conductor wire having narrow stranded wires, with the conductor wire being coiled and/or braided around the outer periphery of the elastic cylinder, and the sheath portion is an outer sheath layer having an insulator that covers the outer periphery of the conductor portion.

Abstract: Disclosed is an extensible optical signal transmission cable having an extensity of 10% or more and an optical transmission loss of less than 20 dB/m when the cable is loosened. The cable comprises an elastic cylinder having the extensity of 10% or more and at least one optical fiber wound around the elastic cylinder. The optical fiber has a bending diameter (R) which is not smaller than the bending limit diameter (Re). The extensible optical signal transmission cable is compliant with shape deformation, can transmit an optical signal when the cable is extended or contracted, and can be used in repetitive extension and contraction.

Abstract: An object of the present invention is to provide an elastic signal transmission cable having a length of several centimeters to several meters that has a shape deformation tracking ability and enables high-speed signal transmission. The inventive elastic signal transmission cable has an elasticity of 10% or more and transmission loss of 10 dB/m or less in a relaxed state at 250 MHz, and comprises an elastic cylindrical body having an elasticity of 10% or more and a conductor portion containing at least two conductor wires wound in the same direction around the elastic cylindrical body.

Abstract: An object of the present invention is to provide an expandable electric cord not requiring a large force (energy loss) for expansion and contraction, able to carry a large current for driving electric power, and having expandability under a small load and low electrical resistance. The inventive expandable electric cord has a structure at least comprised of a core portion, a conductor portion and a sheath portion; wherein, the core portion is an elastic cylinder comprised of an elastic body and an intermediate layer covering the outer periphery thereof, the conductor portion contains a conductor wire comprised of narrow stranded wires, with the conductor wire being coiled and/or braided around the outer periphery of the elastic cylinder, and the sheath portion is an outer sheath layer comprised of an insulator that covers the outer periphery of the conductor portion.