Abstract: A switch-equipped connector that can reduce the occurrence of intermodulation distortion includes a first terminal, a second movable terminal, and a magnet provided at a position distant from the first and second terminals. At least one of the first and the second terminal has a magnetic metal and the second terminal is configured to come into and out of contact with the first terminal.

Abstract: A plane-type speaker where, on one of the main surfaces of an exciter film, there are placed piezoelectric films which are expanded and contracted by sound-releasing driving signals applied thereto. An oscillation plate is secured to the excited film through frame members. The oscillation plate has a flat-plate shape and is secured to the exciter film while having a warped shape such that it is gradually spaced further away from the exciter film, with decreasing distance from the secured ends to a center area, when viewed at a side surface. This realizes a state where the exciter film is pulled outwardly with respect to the secured ends due to bending stresses therein. If sound-releasing driving signals are applied to the piezoelectric films in this state, the exciter film contracts and expands along with the expansion and contraction of the piezoelectric films, thereby causing the oscillation plate to oscillate.

Abstract: A pressure-detecting sensor that includes a piezoelectric sensor, a rectangular plate member, and an attaching member. The piezoelectric sensor is attached to the plate member via the attaching member so that the piezoelectric sensor is located in the vicinity of an end of the plate member in the longitudinal direction of the plate member, and such that the longitudinal direction of the piezoelectric sensor is parallel to the transverse direction of the plate member. The attaching member is composed of a sticky agent having an elastic constant of 106 Pa or lower. The piezoelectric sensor has a shape having aspect ratio of 2.5 or higher.

Abstract: A pressing sensor-equipped display panel that includes a pressing sensor and a display panel. The pressing sensor is arranged between a protecting member which composes an operation surface and the display panel. The pressing sensor includes a piezoelectric film which is made of polylactic acid which is an organic piezoelectric material. Electrodes are formed on both principal surfaces of the piezoelectric film. At least one of the electrodes is made of a polythiophene material. Display image formation light which has been emitted from the display panel and been incident on the pressing sensor transmits through the piezoelectric film and the electrodes. In this regard, a variation of a transmittance of each wavelength of the piezoelectric film, and a variation of a transmittance of each wavelength of an electrode made of the polythiophene material cancel each other.

Abstract: A touch panel that includes a flat membrane-like piezoelectric film provided with a first principal surface and a second principal surface which are opposed to each other. The touch panel includes first and second capacitance detection sub-electrodes on the first principal surface and the second principal surface of the piezoelectric film. The first and second capacitance detection sub-electrodes detect a touched position. The touch panel includes first and second piezoelectric voltage detection sub-electrodes on the first principal surface and the second principal surface of the piezoelectric film. The first and second piezoelectric voltage detection sub-electrodes detect a piezoelectric voltage according to an amount pressed into the piezoelectric film.

Abstract: A plane-type speaker where, on one of the main surfaces of an exciter film, there are placed piezoelectric films which are expanded and contracted by sound-releasing driving signals applied thereto. An oscillation plate is secured to the excited film through frame members. The oscillation plate has a flat-plate shape and is secured to the exciter film while having a warped shape such that it is gradually spaced further away from the exciter film, with decreasing distance from the secured ends to a center area, when viewed at a side surface. This realizes a state where the exciter film is pulled outwardly with respect to the secured ends due to bending stresses therein. If sound-releasing driving signals are applied to the piezoelectric films in this state, the exciter film contracts and expands along with the expansion and contraction of the piezoelectric films, thereby causing the oscillation plate to oscillate.

Abstract: A touch panel that includes a piezoelectric film having a first principal surface and a second principal surface that are opposed to each other, a capacitance detection electrode arranged on one side of the first principal surface of the piezoelectric film and configured to detect a touched position, and a piezoelectric voltage detection electrode arranged on one side of each of the first principal surface and the second principal surface of the piezoelectric film and configured to detect a piezoelectric voltage in accordance with an amount pressed into the piezoelectric film.

Abstract: An electronic device with pressing input function has a substantially rectangular parallelepiped-shaped housing. A display panel with pressure sensor and an arithmetic circuit module are disposed in the housing. The display panel with pressure sensor is composed of a pressure sensor and a display panel. In the display panel, a front polarizing plate is disposed on a front face of a liquid crystal panel. In the pressure sensor, electrodes are formed on both respective flat plate faces of a piezoelectric film having birefringence. The pressure sensor is disposed between the liquid crystal panel and the front polarizing plate of the display panel, and a uniaxial drawing direction of the piezoelectric film is parallel to a polarizing direction of the front polarizing plate.

Abstract: A piezoelectric device is provided with a sound source IC, an amplifier for amplifying a sound source from the sound source IC, a piezoelectric speaker for generating sound based on a drive signal from amplifier, an MPU for performing a predetermined control process on the drive signal, a memory for storing temperature dependency information about the piezoelectric constant (d14) and Young's modulus E of the piezoelectric speaker, and a temperature sensor for detecting an ambient temperature. MPU has correcting unit, compares a detected result of the temperature sensor with the temperature dependency information, and performs temperature correction on the drive signal serving as an acoustic signal based on a compared result. The piezoelectric speaker outputs the acoustic signal temperature-corrected by correcting unit.

Abstract: A touch panel having a piezoelectric sheet with a first region and a second region, and a surface protection film bonded to the second region of the piezoelectric sheet with a non-curable adhesive. The non-curable adhesive has a larger elasticity than a material that bonds the first region of the piezoelectric sheet to the surface protection film.

Abstract: A piezoelectric speaker device that includes an organic polymer piezoelectric film, at least one pair of electrodes provided in contact with the piezoelectric film and the at least one pair of electrodes including a user-side electrode on a first side of the piezoelectric film, an insulation layer on the user-side electrode, a flaw detection electrode line on the insulation layer, and a detection circuit configured to detect whether the flaw detection electrode line is in a normal electric conduction state.

Abstract: An electronic device with pressing input function has a substantially rectangular parallelepiped housing. In the housing, a pressing sensor, a display panel, a protection member, and a computation circuit module are arranged. In the display panel, a polarization plate is arranged on a first side of a liquid crystal panel. In the pressing sensor, electrodes are formed on both planar faces of a piezoelectric film having double refractivity. The pressing sensor is arranged on the operation surface (the display face) side of the housing relative to the front polarization plate.

Abstract: An electronic device with pressing input function includes a substantially rectangular parallelepiped-shaped housing. A pressure sensor, a display panel, a protective member, and an arithmetic circuit module are disposed in the housing. In the display panel, a front polarizing plate is disposed on a front face of a liquid crystal panel. The pressure sensor includes piezoelectric films having birefringence, and electrodes formed on opposed faces of one of the piezoelectric films . The pressure sensor is disposed between the liquid crystal panel and the front polarizing plate. The piezoelectric films are arranged such that their uniaxial drawing directions are orthogonal to each other.

Abstract: A piezoelectric sheet included in a touch panel is provided with a split electrode having a plurality of electrode parts. Lattice-shaped coordinates are set in the touch panel, and voltages generated in the respective electrode parts through pressing manipulations with a predetermined load on the respective lattice points are preliminarily stored in a storage portion as reference voltages. During actual use, actually-measured voltages induced in the respective electrode parts due to a pressing manipulation are detected by a detection portion. The ratios of the measured voltages to the reference voltages are calculated by an operation portion, and the average thereof and the standard deviation there among are determined. The coordinates of the pressed position are determined from the coordinates of four lattice points in the ascending order of standard deviations. The load is multiplied by the ratio to determine the pressing force of the lattice point having a minimum standard deviation.

Abstract: A piezoelectric speaker device that includes an insulation layer having an electric insulation property formed on a user-side driving electrode, and flaw detection electrode lines formed on the insulation layer. If the flaw detection electrode lines are determined to be damaged due to the occurrence of a flaw, the driving voltage applied to the driving electrodes is lowered. In order to prevent electric-shock accidents, the driving voltage is lowered to below 42.4 V, preferably, and to 0 V, more preferably.

Abstract: When determining that a level of a deformation detection signal is greater than a threshold, a controller assumes that a touch operation is performed at an initially-detected position and virtually at another position different from the position, and outputs a position detection signal to a processor indicating that the two touch positions and separate from each other based on the touch position. Thus, the controller converts the deformation detection signal into the position detection signal corresponding to a pinch-out operation, and outputs the position detection signal to the processor.

Abstract: A push-in amount detection sensor includes a piezoelectric film, an electrode-formed protective film, and an adhesive layer. The electrode-formed protective film adheres to the piezoelectric film with the adhesive layer interposed therebetween such that an electrode is located on the side of the piezoelectric film. Relative permittivity ?a of the adhesive layer is higher than relative permittivity ?p of the piezoelectric film. Preferably an electrostatic capacitance per unit area of the adhesive layer is higher than an electrostatic capacitance per unit area of the piezoelectric film, more preferably the electrostatic capacitance per unit area of the adhesive layer is substantially double the electrostatic capacitance per unit area of the piezoelectric film. The thickness of the adhesive layer is set within a predetermined thickness range.

Abstract: A specific region of a polylactic acid sheet is heated by a microwave. To allow the polylactic acid sheet to exhibit piezoelectricity in the thickness direction of the polylactic acid sheet, a high voltage is applied to the heated polylactic acid sheet in the thickness direction of the polylactic acid sheet, and thereby the screw axes of at least a part of the polylactic acid molecules are relatively aligned with the thickness direction. Then the polylactic acid sheet is rapidly cooled, and thereby the polylactic acid molecules are immobilized. The same step is executed for other regions of the polylactic acid sheet, and thereby piezoelectricity is imparted to a wide area of the polylactic acid sheet in the thickness direction. The resultant piezoelectric sheet is capable of exhibiting a high piezoelectricity in the thickness direction.

Abstract: A touch panel capable of detecting a pen and a finger, capable of corresponding to multi-touch, capable of detecting pressing force, and capable of reducing the use amount of a transparent electrode as much as possible. The touch panel has a piezoelectric sheet of poly-L-lactic acid having a predetermined stretching axial direction, electrodes that are opposed to each other and formed on the piezoelectric sheet do not cover the entire surface of the piezoelectric sheet and are formed so that they are discretely distributed in plural positions. The piezoelectric sheet is brought into the condition that tension is imparted in directions not coincident with the stretching axial direction.

Abstract: A displacement detection sensor has a plate member and piezoelectric sensors with a piezoelectric film of PLLA. The piezoelectric sensors are mounted on the face of the plate member on the opposite side of the operation surface thereof. Tensile stresses are generated in the entire face of the plate member at pressing the operation surface. The piezoelectric sensor is mounted so that the direction of macro tensile stress in the plate member in the region in which the piezoelectric sensor is mounted and molecular orientation direction of the piezoelectric film intersect each other at an angle of 45°. The piezoelectric sensor is mounted so that the direction of macro tensile stress in the plate member in the region in which the piezoelectric sensor is mounted and molecular orientation direction of the piezoelectric film intersect each other at an angle of approximately 45°.