A human body detection device including line-shaped piezoelectric substrates respectively provided in each of a plurality of regions in a plate material intersecting a direction of pressure received from a human body, and provided such that an axial direction of each of the piezoelectric substrates runs along the plate material so as to detect pressure applied in a radial direction of the piezoelectric substrate, memory, and a processor coupled to the memory. The processor is configured to be capable of detecting an output signal from each of the piezoelectric substrates.

Provided is a technique related to a new sensor unit which is flexible in that the sensor unit can be installed in various locations such as inside of a structure with a large curvature, and which can stably measure multi-directional deformation and very efficiently and wireless measure deformation information, and thus provided is a technique of a sensor structure which can be universally utilized in various systems for measuring deformation information. The sensor unit using an electro-active polymer for the wireless transmission/reception of deformation information, according to a first embodiment of the present invention, comprises: a first sensor part formed from a fiber or film comprising a ferroelectric electro-active polymer material; a second sensor part configured to include the first sensor part therein, and formed from a matrix comprising a dielectric elastomer electro-active polymer material; and an electrode part provided to come into contact with the first sensor part or the second sensor part and, when an external force is applied to the first sensor part or the second sensor part, transmits to the outside an electric signal generated by the first sensor part or the second sensor part.

The present disclosure provides an ionic ring comprising a number of piezoelectric elements, a piezoelectric device including the ionic ring, and a piezoelectric generator including the ionic ring and host devices incorporating the piezoelectric generator. The piezoelectric generator can be used to generate energy on a portable electronic device in response to mechanical deformation. The generated energy can be used instead of a battery of the portable electronic device or can be used to charge the battery.

A piezoelectric coaxial sensor includes: a center conductor including a conductive wire; a polymer piezoelectric layer covering an outer peripheral surface of the center conductor; a first outer conductor surrounding an outer peripheral surface of the polymer piezoelectric layer; a first jacket layer covering an outer peripheral surface of the first outer conductor; and a second outer conductor surrounding an outer peripheral surface of the first jacket layer. A voltage is generated between the center conductor and the first outer conductor based on induced charges generated in the polymer piezoelectric layer.

A piezoelectric coaxial sensor includes: a center conductor including a conductive wire; a polymer piezoelectric layer covering an outer peripheral surface of the center conductor; a first outer conductor surrounding an outer peripheral surface of the polymer piezoelectric layer; a first jacket layer covering an outer peripheral surface of the first outer conductor; and a second outer conductor surrounding an outer peripheral surface of the first jacket layer. A voltage is generated between the center conductor and the first outer conductor based on induced charges generated in the polymer piezoelectric layer.

A piezoelectric coaxial sensor includes: a sensor portion including a center conductor having a linear shape, a polymer piezoelectric layer containing polyvinylidene fluoride and that covers an outer peripheral surface of the center conductor, and a first outer conductor that surrounds an outer peripheral surface of the polymer piezoelectric layer; and jacket layers that each include a film having a tape shape wound to surround an outer peripheral surface of the sensor portion. The film of at least one of the jacket layers exposed to the outside of the piezoelectric coaxial sensor among the other jacket layers is adhered to a member in contact with an adhesive layer by the adhesive layer. The adhesive layer includes a thermoplastic resin having a melting point of 120 C. or lower.

A piezoelectric coaxial sensor includes: a sensor portion including a center conductor having a linear shape, a polymer piezoelectric layer containing polyvinylidene fluoride and that covers an outer peripheral surface of the center conductor, and a first outer conductor that surrounds an outer peripheral surface of the polymer piezoelectric layer; and jacket layers that each include a film having a tape shape wound to surround an outer peripheral surface of the sensor portion. The film of at least one of the jacket layers exposed to the outside of the piezoelectric coaxial sensor among the other jacket layers is adhered to a member in contact with an adhesive layer by the adhesive layer. The adhesive layer includes a thermoplastic resin having a melting point of 120 C. or lower.