Provided is a configuration capable of improving the signal strength of a piezoelectric element using piezoelectric fibers. This braided piezoelectric element comprises a core comprising conductive fibers and a sheath comprising braided piezoelectric fibers so as to cover the core, the braided piezoelectric element further comprising a metal terminal connected and fixed to the core in either of the following states A or B. A) A state where a portion of the metal terminal grasps a fiber portion constituting the end of a braided piezoelectric element and the core and the metal terminal are electrically connected to each other and fixed within 1 mm from where the metal terminal grasps the fiber portion. B) A state where: a portion of the metal terminal has a fork or needle shape; the fork-shaped or needle-shaped portion is electrically connected to the core while in contact with the sheath; and the braided piezoelectric element is secured to the metal terminal by another portion of the metal terminal or a component fixed to the metal terminal within 10 mm from the point of the electrical connection.

Sensing an environment by confining a monitored live subject in an enclosure, detecting an effect on a coaxial piezoelectric cable resulting from the monitored live subject, wherein the coaxial piezoelectric cable is located at least proximate to the enclosure, and deriving information about a state of the monitored live subject based on the detected effect.

A case, a piezoelectric vibrator, and a wire are provided. The case has a bottomed cylindrical shape, the case including a bottom portion and a side wall portion. The piezoelectric vibrator includes piezoelectric ceramic containing Ti and Zr, and is attached to the bottom portion inside the case. The wire is connected to the piezoelectric vibrator and extends to an outside of the case. A resonance frequency in a spreading vibration mode of the piezoelectric ceramic not attached to the bottom portion becomes minimum at a temperature in a range of about ?30? C. or higher and about 10? C. or lower. A cross-sectional porosity in any longitudinal cross section of the piezoelectric ceramic is about 1% or less.

A sensor electric wire that is not readily affected by external noise, and a sensor circuit that uses the same, including a first internal conductor covered by a piezoelectric material, a second internal conductor provided on the outside of the piezoelectric material, and an external shield conductor surrounding the first internal conductor and the second internal conductor, an insulating body being disposed between the first internal conductor and second internal conductor, and the external shield conductor.

A sensor electric wire that is not readily affected by external noise, and a sensor circuit that uses the same, including a first internal conductor covered by a piezoelectric material, a second internal conductor provided on the outside of the piezoelectric material, and an external shield conductor surrounding the first internal conductor and the second internal conductor, an insulating body being disposed between the first internal conductor and second internal conductor, and the external shield conductor.

This disclosure relates to fiber actuators for providing haptic feedback, and haptic actuation resulting from mechanical and/or electrostatic (non-mechanical) interactions with the fiber actuators. Such fiber actuators are useful in structural materials, including as elements of wearables or accessories.

This disclosure relates to fiber actuators for providing haptic feedback, and haptic actuation resulting from mechanical and/or electrostatic (non-mechanical) interactions with the fiber actuators. Such fiber actuators are useful in structural materials, including as elements of wearables or accessories.

A method of fabricating a pressure sensor is disclosed. Initially, a first metal is deposited on top of a substrate, and the first metal is patterned accordingly. A PVDF-TrFE nano fiber is then deposited on top of the first metal layer, and the PVDF-TrFE nano fiber is etched. A second metal layer is subsequently deposited on top of the PVDF-TrFE nano fiber, and the second metal layer is etched to form a pressure sensor.

It is disclosed a composite yarn structure (10) comprising: a first element (15) comprising a coaxial flexible bi-component monofilament including a conductive component (20) and a thermoplastic component (30) exhibiting piezoelectric properties, at least a second element (40) twisted around the first element (15), wherein the second element (40) has a lower elasticity with respect to the elasticity of the first element (15) such that, upon elongation of the yarn structure (10) in a first direction, the yarn structure (10) expands in a second direction, whereby the dimensions of the yarn are increased both in first and second directions to generate an additional force on said piezoelectric component of the first element.

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.