Abstract: A solid electrolytic capacitor includes: an anode foil on which an oxide film is formed; a cathode foil; and a separator between the anode and cathode foils, wherein a solid electrolyte in a fine particle form made of a conductive high molecular weight compound and a water-soluble high-molecular weight compound in a liquid form are introduced into a gap between the anode and cathode foils in a state where the water-soluble high-molecular weight compound in a liquid form surrounds the solid electrolyte, and a ratio of an area that the solid electrolyte occupies in the gap is set to a value which falls within a range of 1 vol % to 30 vol %, and a ratio of an area that the water-soluble high-molecular weight compound in a liquid form occupies in the gap is set to a value which falls within a range of 10 vol % to 99 vol %.

Abstract: Provided is a solid electrolyte capacitor which includes: a bottomed cylindrical housing which includes a bottom surface portion and a side surface portion raised from the bottom surface portion, and has an opening portion formed on an edge portion of the side surface portion; a capacitor element which is accommodated in the inside of the housing, and is formed by winding an anode foil and a cathode foil in an overlapping state with a separator interposed therebetween and by filling a space formed between the anode foil and the cathode foil with a solid electrolyte; a sealing member which seals the opening portion of the housing in a state where the capacitor element is accommodated in the inside of the housing; and a composite sheet which is arranged between the bottom surface portion of the housing and the capacitor element, and has the structure where a resin made of a high-molecular weight compound is retained in a fiber sheet containing at least cellulose fibers.

Abstract: A solid electrolyte capacitor includes a bottomed cylindrical housing having a bottom surface portion, a side surface portion raised from the bottom surface portion and an opening portion formed on an end portion of the side surface portion; a capacitor element housed in the inside of the housing, the capacitor element being formed by winding an anode foil and a cathode foil in an overlapping state with a separator interposed therebetween and by filling a solid electrolyte between the anode foil and the cathode foil; and a sealing member sealing the opening portion of the housing in a state where the capacitor element is housed in the inside of the housing, wherein an oxide film repairing body made of a hydrophilic synthetic resin is disposed at least one of between the bottom surface portion and the capacitor element of the housing and between the capacitor element and the sealing member.

Abstract: A solid electrolyte capacitor includes an anode foil on a surface of which an oxide film is formed, a cathode foil, and a separator. A gap between the anode foil and the cathode foil is filled with a solid electrolyte which contains a conductive fine particles containing a conductive polymer compound and a hydrophilic polymer compound. The hydrophilic polymer compound has a structure expressed by a following chemical formula (I) and a structure expressed by a following chemical formula (II). —(R1—O)—??(I) —(R2—O)—??(II) In the formula (I) and the formula (II), R1 and R2 are groups selected from the set consisting of a substituted or unsubstituted alkylene, a substituted or unsubstituted alkenylene, and a substituted or unsubstituted phenylene, and represent mutually different groups.

Abstract: A keyboard apparatus, including: a key that is pivotable by depressing and release operations between: a pivotal movement start position corresponding to a non-key depression state; and a pivotal movement end position corresponding to a key-depression end state; a hammer body that is pivotable between: a pivotal movement start position; and a pivotal movement end position for imparting inertia to the key depressing operation; and an elastic portion to apply elastic force to at least one of the key and the hammer body, wherein the elastic portion is configured not to apply the elastic force to the key and the hammer body in the non-key depression state and configured to start to apply the elastic force in a direction toward the pivotal movement start position to the at least one of the key and the hammer body from a certain point in a forward stroke of the key depressing operation.

Abstract: A displacement detecting apparatus of an electromagnetic actuator, including: an electromagnetic actuator including: a movable core; a drive coil which causes a displacement of the movable core; and a detection coil disposed at a position where a mutual coupling coefficient with the drive coil changes with the displacement, the actuator transmitting a drive force of the movable core to a mechanical system; a drive portion for supplying a drive current to the drive coil on the basis of a pulse width modulation signal; and a displacement detecting portion to which an output voltage of the detection coil is inputted, for outputting a displacement detection signal, wherein the displacement detecting portion includes: a sampling-signal generating portion for generating a sampling signal in synchronism with the pulse width modulation signal; and a synchronous sampling portion for outputting the displacement detection signal by sampling the output voltage in synchronism with the sampling signal.

Abstract: An electronic keyboard musical instrument, including: a key; a mass body driven by a depressed key for pivotally moving in a movement region between a rest position and an end position; a back check portion to back check the mass body; a position detecting portion to detect a position of the mass body; and a controller for controlling silencing of a tone, such that the currently generated tone is silenced when the mass body reaches a preset tone silencing position in its movement from the end position to the rest position, wherein the controller is configured to change the tone silencing position on the basis of respective times required for the mass body to pass through first and second sub regions of the movement region in the movement of the mass body, the second sub region being located nearer to the rest position than the first sub region.

Abstract: A keyboard apparatus wherein a hammer body having movable and stationary engagement portions is configured such that, in its pivotal movement in a forward direction, a click feeling in a key depression touch is generated when the movable engagement portion comes into contact with and gets over the stationary engagement portion, wherein a distance from a hammer pivot shaft to the movable engagement portion at a certain key stroke position in a key depression stroke becomes smaller with an increase in a pressing drive force, and wherein the movable engagement portion comes into contact with the stationary engagement portion in the pivotal movement in the forward direction where a magnitude of the pressing drive force is less than a prescribed value, and the movable engagement portion does not come into contact with the same where the magnitude of the force is equal to or larger than the prescribed value.

Abstract: A keyboard apparatus, including: a key that is pivotable by depressing and release operations between: a pivotal movement start position corresponding to a non-key depression state; and a pivotal movement end position corresponding to a key-depression end state; a hammer body that is pivotable between: a pivotal movement start position; and a pivotal movement end position for imparting inertia to the key depressing operation; and an elastic portion to apply elastic force to at least one of the key and the hammer body, wherein the elastic portion is configured not to apply the elastic force to the key and the hammer body in the non-key depression state and configured to start to apply the elastic force in a direction toward the pivotal movement start position to the at least one of the key and the hammer body from a certain point in a forward stroke of the key depressing operation.

Abstract: A keyboard apparatus includes a key supported for pivoting movement about a pivot point, a mass member for imparting a reaction force to performance operation of the key in interlocked relation to the key, a transmission member provided in abutment with both of the key and mass member to transmit a load from one of the key and mass member to the other, and an electromagnetic actuator for driving, via a fixed coil, the transmission member toward at least one of the key or mass member. Good key touch feeling can be achieved not only by a load applied from the mass member to the key but also through load control by the actuator. Thus, it is possible to faithfully reproduce a key touch feeling approximate to that in a natural keyboard instrument, such as an acoustic piano, with a simple construction and facilitated control.

Abstract: Different kinds of control tables in which action of a pedal 4 is associated with reaction force exerted on the pedal 4 by an actuator 7 are stored in a memory of an electronic keyboard musical instrument 26. The different kinds of control tables are designed to include a half pedal range. A CPU 40 selects one of the different kinds of control tables in accordance with player's manipulation of setting operators 28 to obtain a reaction force exerted on the pedal 4 by the actuator 7 from the selected control table, the reaction force being associated with an action detected by an action detecting portion 6. The CPU 40 also controls the actuator 7 such that the actuator 7 exerts the obtained reaction force on the pedal 4.

Abstract: In a keyboard apparatus including a key supported for pivoting movement about a pivot point, a mass member that imparts a reaction force to performance operation of the key in interlocked relation to the key, and an electromagnetic actuator provided between the key and the mass member for imparting a driving force to the key and mass member, a transmission member is provided in detachable abutment with the key and mass member. The transmission member can be disengaged from the key or the mass member depending on operating conditions of the key and the mass member. Thus, it is possible to not only prevent unnecessary binding forces from acting in areas where the transmission member and the key and the mass member abut against each other, but also achieve smooth movement of the key and the mass member and prevent increase of inertial mass of the transmission member. The smooth movement of the key and mass member can achieve force sense control with good responsiveness.

Abstract: A keyboard musical instrument has a solenoid including a plunger and a coil into which the plunger is inserted, a drive unit for applying voltage to the solenoid, and a key which moves together with the plunger, and on which a force generated by the solenoid is exerted. The drive unit includes a position detector for detecting position of the key in the direction in which the key is depressed or released. By varying voltage which is to be applied to the solenoid in accordance with the position of the key detected by the position detector while the key is in motion, the drive unit varies the force which is to be generated by the solenoid.

Abstract: A displacement detecting apparatus of an electromagnetic actuator, including: an electromagnetic actuator including: a movable core; a drive coil which causes a displacement of the movable core; and a detection coil disposed at a position where a mutual coupling coefficient with the drive coil changes with the displacement, the actuator transmitting a drive force of the movable core to a mechanical system; a drive portion for supplying a drive current to the drive coil on the basis of a pulse width modulation signal; and a displacement detecting portion to which an output voltage of the detection coil is inputted, for outputting a displacement detection signal, wherein the displacement detecting portion includes: a sampling-signal generating portion for generating a sampling signal in synchronism with the pulse width modulation signal; and a synchronous sampling portion for outputting the displacement detection signal by sampling the output voltage in synchronism with the sampling signal.

Abstract: A keyboard apparatus includes plural keys, electronic actuators, reflection plates, and optical sensors. Each key extends in the longitudinal direction and pivots in the vertical direction about a support in accordance with key depression and release. Each electronic actuator has a movable member that displaces vertically when interlocking with a key's pivot movement so as to apply a reaction force against key depression. Each plural reflection plate is fixed to the electronic actuator's movable member, wherein the reflection surface faces the lateral direction of each of the keys. The light reflectance changes along the displacing direction of the movable member. Each optical sensor is arranged apart from the longitudinal axis of the keys in the lateral direction. It emits light toward the reflection plate and receives the reflected light from the reflection plate so as to output an electric signal according to the quantity of received light.

Abstract: Reactive force control apparatus for a pedal comprises: a movement detection section that detects movement of the pedal; a solenoid that produces a reactive force in response to operation of the pedal; a reference reactive force impartment table defining intensities of the reactive force corresponding to amounts of the operation of the pedal; a setting value input section operable to input a setting value for changing the reactive force responsive to the operation of the pedal; and a control section that controls the reactive force to the pedal by changing content of the table, on the basis of the input setting value, to thereby create a changed reactive force impartment table, so that the reactive force to the pedal is controlled on the basis of the changed table and detected movement of the pedal.

Abstract: In order to improve a touch of a key of a keyboard musical instrument by using a key actuating apparatus which actuates the key supported so as to be rotationally movable with regard to a frame of the keyboard musical apparatus, a key actuating apparatus (1) includes: a plunger (15) which is moved on an arc or curved line in correspondence with a rotational motion of a key (3); and a solenoid (7) including electro magnets (17 and 19) which are fixed to the frame and which are substantially in a cylindrical shape into which the plunger is inserted. The plunger (15) is formed in an arc or curved shape extended in a direction of a rotational motion of the plunger (15). A head end (15b) arranged on the plunger (15) in a lengthwise direction is made from a magnetic body.

Abstract: A computer portion 70 determines main reaction force RF0 by use of a main reaction force table storing main reaction forces which vary according to the velocity and the depth of a depression of the key 11. The computer portion 70 determines first ancillary reaction force RF1 by use of a first ancillary reaction force table storing first ancillary reaction forces which vary according to the amount of depression of a lever 32 of a pedal apparatus 30. The computer portion 70 adds the first ancillary reaction force RF1 to the main reaction force RF0 to obtain a composite reaction force to control a solenoid 21 on the basis of the composite reaction force so that a reaction force which is to be exerted on the key 11 will be the composite reaction force.

Abstract: A keyboard apparatus includes a key supported for pivoting movement about a pivot point, a mass member for imparting a reaction force to performance operation of the key in interlocked relation to the key, a transmission member provided in abutment with both of the key and mass member to transmit a load from one of the key and mass member to the other, and an electromagnetic actuator for driving, via a fixed coil, the transmission member toward at least one of the key or mass member. Good key touch feeling can be achieved not only by a load applied from the mass member to the key but also through load control by the actuator. Thus, it is possible to faithfully reproduce a key touch feeling approximate to that in a natural keyboard instrument, such as an acoustic piano, with a simple construction and facilitated control.

Abstract: In a keyboard apparatus including a key supported for pivoting movement about a pivot point, a mass member that imparts a reaction force to performance operation of the key in interlocked relation to the key, and an electromagnetic actuator provided between the key and the mass member for imparting a driving force to the key and mass member, a transmission member is provided in detachable abutment with the key and mass member. The transmission member can be disengaged from the key or the mass member depending on operating conditions of the key and the mass member. Thus, it is possible to not only prevent unnecessary binding forces from acting in areas where the transmission member and the key and the mass member abut against each other, but also achieve smooth movement of the key and the mass member and prevent increase of inertial mass of the transmission member. The smooth movement of the key and mass member can achieve force sense control with good responsiveness.