Abstract: A vibration device includes a first vibration plate having a length direction, the first vibration plate including a first end portion at one end in the length direction and a second end portion at another end in the length direction, a first piezoelectric element provided on the first vibration plate, a first conductive wiring line joined to the first piezoelectric element at a position closer to the first end portion in the length direction than a center of the first vibration plate, a first fixed component connected to the first conductive wiring line, and a case component to which the first fixed component is fixed. The second end portion is a free end, and the first conductive wiring line includes a bent portion.

Abstract: A vibrating device includes a first case, a second case joined to the first case, flexible bodies each including a free end, piezoelectric elements attached to the respective flexible bodies, and a mass joined to the flexible bodies. The first case has a flat plate shape. The second case includes a bottom and a lateral wall. The vibrating device further includes holder in contact with the first case, the lateral wall, and the bottom.

Abstract: A vibration device includes a first vibration plate having a length direction, the first vibration plate including a first end portion at one end in the length direction and a second end portion at another end in the length direction, a first piezoelectric element provided on the first vibration plate, a first conductive wiring line joined to the first piezoelectric element at a position closer to the first end portion in the length direction than a center of the first vibration plate, a first fixed component connected to the first conductive wiring line, and a case component to which the first fixed component is fixed. The second end portion is a free end, and the first conductive wiring line includes a bent portion.

Abstract: A rotary encoder includes a shaft and an encoder mechanism that holds the shaft in a rotatably inserted state and detects a rotation direction and a rotation angle of the shaft. The encoder mechanism includes a substrate that rotatably holds the shaft, an insulator portion and a resistor portion provided on one surface of the substrate and alternately provided in the rotation direction of the shaft, a rotor attached to the shaft so as to be integrally rotatable with the shaft, and a slider that is attached to the rotor and alternately slidably contacts the insulator portion and the resistor portion by rotation of the shaft. The insulator portion includes a base material made of a resin, spherical silica, and a fluororesin filler.

Abstract: A rotary electronic component includes a base member, a shaft attached to the base member so as to be rotatable around an axis, and a regulating member that regulates a rotation angle of the shaft. The shaft includes a flange section including a projecting sections and recessed sections alternately disposed in a circumferential direction. The regulating member includes a contact member in contact with the projecting sections and the recessed sections of the flange section of the shaft, and a biasing member that biases the contact member radially inwardly toward the shaft.

Abstract: A rotary encoder includes a shaft and an encoder mechanism that holds the shaft in a rotatably inserted state and detects a rotation direction and a rotation angle of the shaft. The encoder mechanism includes a substrate that rotatably holds the shaft, an insulator portion and a resistor portion provided on one surface of the substrate and alternately provided in the rotation direction of the shaft, a rotor attached to the shaft so as to be integrally rotatable with the shaft, and a slider that is attached to the rotor and alternately slidably contacts the insulator portion and the resistor portion by rotation of the shaft. The insulator portion includes a base material made of a resin, spherical silica, and a fluororesin filler.

Abstract: A rotary electronic component includes a base member, a shaft attached to the base member so as to be rotatable around an axis, and a regulating member that regulates a rotation angle of the shaft. The shaft includes a flange section including a projecting sections and recessed sections alternately disposed in a circumferential direction. The regulating member includes a contact member in contact with the projecting sections and the recessed sections of the flange section of the shaft, and a biasing member that biases the contact member radially inwardly toward the shaft.

Abstract: A rotary variable resistor includes an insulating substrate, a resistor pattern and a current collector pattern that are provided on the insulating substrate, a rotor that is mounted on the insulating substrate in a rotatable manner, and a slider that is mounted on the rotor and makes sliding contact with the resistor pattern and the current collector pattern to cause the resistor pattern and the current collector pattern to be conducted to each other. When a maximum dimension of the resistor pattern, which defines a variable resistor, is Z [mm] and electric linearity is L [%], Z?4.0 and Z×L<10 are satisfied.

Abstract: A rotary variable resistor includes an insulating substrate, a resistor pattern and a current collector pattern that are provided on the insulating substrate, a rotor that is mounted on the insulating substrate in a rotatable manner, and a slider that is mounted on the rotor and makes sliding contact with the resistor pattern and the current collector pattern to cause the resistor pattern and the current collector pattern to be conducted to each other. When a maximum dimension of the resistor pattern, which defines a variable resistor, is Z [mm] and electric linearity is L [%], Z?4.0 and Z×L<10 are satisfied.

Abstract: A detection device and a rotation angle sensor include a case body and a cover member. A support portion in the case body is provided with fitting protuberances fitted in fitting holes of a printed board, on which a detection component is mounted, so as to position the printed board. Each protuberance has ribs protruding from an outer peripheral surface thereof. The ribs are elastically or plastically deformed by contact with an inner peripheral surface of the corresponding fitting hole of the board, and position the board along a support surface of the support portion. A projecting portion of the cover member is elastically or plastically deformed so as to urge the board toward the support surface of the support portion so that the board is clamped between the projecting portion and the support surface and is positioned in a direction perpendicular to the support surface of the support portion.

Abstract: A detection device and a rotation angle sensor reduce the bending stress of a substrate, avoid breaking, peeling, and soldering cracks of patterns, and provide high reliability and low production cost. A detection device includes an outer case defined by a case body and a cover member. A support portion in the case body is provided with fitting protuberances that are fitted in fitting holes of a printed board, on which a detection component is mounted, so as to position the printed board. Each protuberance has ribs protruding from an outer peripheral surface thereof. The ribs are elastically or plastically deformed by contact with an inner peripheral surface of the corresponding fitting hole of the printed board, and position the board along a support surface of the support portion.

Abstract: An angle sensor includes a magnet fixed to a rotational shaft and a Hall device disposed at neutral detection position C such that it faces the magnet, thereby detecting the rotational angle of the magnet based on an output of the Hall device. A magnetic member is attached to each of the magnetic poles of the magnet so that the maximum magnetic flux portions are away from the neutral detection position C in the circumferential direction of the shaft, thereby allowing the magnetic flux distribution to be biased to the direction opposite from the Hall device.

Abstract: An angle sensor includes a magnet fixed to a rotational shaft and a Hall device disposed at neutral detection position C such that it faces the magnet, thereby detecting the rotational angle of the magnet based on an output of the Hall device. A magnetic member is attached to each of the magnetic poles of the magnet so that the maximum magnetic flux portions are away from the neutral detection position C in the circumferential direction of the shaft, thereby allowing the magnetic flux distribution to be biased to the direction opposite from the Hall device.

Abstract: A grinding method, in which the grinding operation is performed on a plurality of workpieces having different thicknesses with an end surface in the thickness direction of each workpiece being a surface to be ground, includes the steps of holding the workpieces with a holder such that the surfaces to be ground of the individual workpieces are aligned in the same plane, and grinding the surfaces to be ground of the workpieces while the workpieces are held by the holder. An electronic component provided with an element ground by the grinding method, and a variable capacitor provided with an element ground by the grinding method are also disclosed.

Abstract: A method for producing a stator for use in a variable capacitor includes providing a stator having a protruded portion provided on a first main surface of a stator component such that the top surface of the protruded portion has a height greater than the thickness of each of conductive films disposed thereon. The method also includes polishing the first main surface of the stator component using the top surface of the protruded portion as a reference.

Abstract: A grinding method, in which the grinding operation is performed on a plurality of workpieces having different thicknesses with an end surface in the thickness direction of each workpiece being a surface to be ground, includes the steps of holding the workpieces with a holder such that the surfaces to be ground of the individual workpieces are aligned in the same plane, and grinding the surfaces to be ground of the workpieces while the workpieces are held by the holder. An electronic component provided with an element ground by the grinding method, and a variable capacitor provided with an element ground by the grinding method are also disclosed.

Abstract: A variable capacitor includes a stator having a protruded portion provided on a first main surface of a stator component such that the top surface of the protruded portion has a height greater than the thickness of each of conductive films disposed thereon. The first main surface of the stator component is polished using the top surface of the protruded portion as a reference.

Abstract: An inductance/capacitance (LC) composite module with a built-in variable capacitor and coil is disclosed which includes a dielectric substrate having one principal surface on which a stator-side electrode is formed. Also formed thereon are a first terminal electrode connected to the stator-side electrode and a second terminal electrode independent of the first terminal electrode. The variable capacitor has a rotor of a chosen solid-state dielectric material in contact with the stator-side electrode. This rotor has thereon a rotor-side electrode which opposes the stator-side electrode with at least part of the rotor laid therebetween, thus forming an electrostatic capacitance. A rotatable support member is mounted so that it may rotate about the axis line at right angles to the substrate surface. The support member transmits its rotation to the rotor allowing the rotor to rotate with the support member.

Abstract: Manufacture of a metal rotor for a trimmer capacitor using cold forging or casting conventionally requires a metal mold to be exclusively used for the metal rotor, which incurs costs associated with the fabrication and maintenance of the mold. According to the invention, however, a metal rotor can be obtained by etching instead of cold forging or casting. Specifically, a metal plate is provided which has a principal surface with a predetermined degree of smoothness for a surface of a rotor electrode. The metal plate is selectively etched using resists, to form a step portion, a driver groove and a circumferential surface for the rotor electrode, which are the components of the metal rotor.

Abstract: In a variable capacitor having a stator with a stator electrode and a rotor with a rotor electrode both of which are housed in a recess section of a casing while allowing the recess section to be closed by a cover, enabling the rotor to be brought into stable close contact with the stator. To this end, a cover (46) made of a chosen metal includes a cover main body (55) which covers the upper opening of a recess section (45) except for an adjustment hole (54) that exposes a driver groove (30) of the rotor (43), leg sections (56, 57) which engage a casing (44) letting the cover main body (55) be secured to the casing (44), and a rotor terminal. The cover main body (55) has a size corresponding to the outer diameter of the variable capacitor (41). This cover main body (55) may have a vent shape so as to create intended elastic force which may act to compress the rotor (43) against the stator (42).