JP2016140060A5 - - Google Patents

Claims (19)

A flat plate-shaped diaphragm, and an actuator that vibrates the diaphragm in response to an input electric signal,
The actuator is
A vibration transmission plate having a flat plate shape, and a coil formed by alternately winding a coil wire around one surface side and the other surface side of the vibration transmission plate, the coil having a longitudinal direction, A voice coil arranged with a space and a surface of the vibration transmission plate;
A pair of hard wires that are spaced apart so as to form a space in which the voice coil can be placed and are arranged so that one pole sides having the same polarity face each other to form a repulsive magnetic field in the space. A pair of soft magnetic members disposed on the other pole side so as to sandwich the magnetic member and the pair of hard magnetic members, and joined to each other to support the pair of hard magnetic members; Is a repulsive magnetic circuit arranged so that an opening region is formed in a uniaxial direction in the space formed by the pair of hard magnetic members;
Consisting of
The voice coil is disposed in a space formed by the hard magnetic member with a clearance from a pair of hard magnetic members in the repulsive magnetic circuit, and is driven in the same direction as the surface direction of the diaphragm. The vibration transmission plate is joined so that one edge of the vibration transmission plate is continuous with the edge of the vibration plate,
The universal speaker, wherein the diaphragm is arranged so as to form a curved surface portion that is curved from one end side joined to the vibration transmission plate of the actuator toward the other end side.   The universal speaker according to claim 1, further comprising a housing that supports both side edges along the driving direction of the diaphragm.   The universal speaker according to claim 2, wherein both side edges of the diaphragm are supported by the housing via elastic members sandwiched in two opposite directions.   The universal speaker according to claim 3, wherein the elastic member supports the diaphragm by applying pressure thereto.   The universal speaker according to any one of claims 1 to 4, wherein a sheet-like member is stuck so as to straddle a joint portion between the vibration plate and the vibration transmission plate.   The universal speaker according to claim 5, wherein the diaphragm and the vibration transmission plate are separately formed of different materials.   The universal speaker according to any one of claims 1 to 4, wherein the vibration plate and the vibration transmission plate are integrally formed of the same member.   The universal speaker according to any one of claims 1 to 7, wherein the diaphragm is gradually narrowed toward the one end side.   The universal speaker according to any one of claims 1 to 8, wherein the diaphragm has rounded upper edge corners on both sides on the one end side.   The universal speaker according to any one of claims 1 to 9, wherein a plurality of the actuators are attached to one end side of the diaphragm.   The universal speaker according to any one of claims 1 to 10, wherein the actuator is further attached to the other end of the diaphragm.   The universal speaker according to any one of claims 1 to 11, wherein the diaphragm further includes an actuator using a piezoelectric body in the curved surface portion.   The universal speaker according to claim 12, wherein the actuator is attached to a center of the curved surface portion.   The universal speaker according to claim 12, wherein the actuator is attached to the other end of the curved surface portion.   The electric signal is further provided with a means for dividing the electric signal into several frequency bands, and the divided electric signals are respectively input to different actuators.   The universal speaker according to any one of claims 1 to 15, wherein the diaphragm has a curved portion with a bending angle of 90 ° to 130 °. The universal speaker according to any one of claims 2 to 16, wherein an opening is provided between the other end side of the diaphragm and the bottom plate of the housing. In addition to the first speaker unit consisting of the actuator and the vibrating plate, claim 2, characterized in that said are provided inside the housing further a second speaker unit to claim 17 1 The universal speaker as described in the item. The universal speaker according to claim 18, wherein the housing includes a partition wall that partitions the first speaker unit and the second speaker unit.