Reciprocating vibration generator
A reciprocating vibration generator making the magnetic circuit of a permanent magnet a closed loop so as to obtain a high vibration force, specifically a vibration linear actuator having a ring-shaped weight, a reciprocating vibrator having a ring-shaped permanent magnet in a center hole of the weight, a first plate spring and a second plate spring supporting this reciprocating vibrator with respect to a recessed case and an end plate to be able to elastically displace in a thickness direction between a first end face and a second end face, a tube-shaped toroidal coil running through a center hole of the ring-shaped permanent magnet and generating a reciprocating vibration magnetic field for driving the ring-shaped permanent magnet to reciprocate in the thickness direction, and a columnar core running through the inside of this toroidal coil, wherein the ring-shaped permanent magnet is magnetized in the thickness direction, and the toroidal coil has a lower stage toroidal coil and an upper stage toroidal coil coaxial with and adjacent to the same, wound in the opposite direction, and connected in series with the same.
1. A reciprocating vibration generator comprising:
a reciprocating vibrator comprising a ring-shaped permanent magnet having a center hole, wherein the ring-shaped permanent magnet has a first end face and a second end face, wherein a thickness direction is defined as a direction extending between the first end face and the second end face, wherein the ring-shaped permanent magnet is magnetized in said thickness direction;
suspension spring means for supporting said reciprocating vibrator with respect to a fastening part in a manner able to be elastically displaced in the thickness direction;
a first tube-shaped toroidal coil running through the center hole of the ring-shaped permanent magnet, the first tube-shaped toroidal coil having a first inside end, and
a second tube-shaped toroidal coil running through the center hole of the ring-shaped permanent magnet, the second tube-shaped toroidal coil having a second inside end,
wherein a magnetization direction of the first tube-shaped toroidal coil and the second tube-shaped toroidal coil substantially corresponds to the thickness direction,
wherein the second tube-shaped toroidal coil is coaxial with the first tube-shaped toroidal coil such that the first inside end faces the second inside end,
wherein the first inside end and the second inside end have the same magnetic pole.
2. A reciprocating vibration generator as set forth in claim 1 , further comprising:
a first ring-shaped pole piece superposed at said first end face and having an inner circumferential edge approaching an outer circumferential surface of said first toroidal coil and;
a second ring-shaped pole piece superposed at said second end face and having an inner circumferential edge approaching an outer circumferential surface of said second toroidal coil.
3. A reciprocating vibration generator as set forth in claim 1 , wherein said outer circumferential surface of both of the first tube-shaped toroidal coil and the second tube-shaped toroidal coil is covered by a protective tubular member.
4. A reciprocating vibration generator as set forth in claim 1 , wherein a magnetic fluid is interposed between an outer circumferential surface of said protective tubular member and an inner circumferential surface of said ring-shaped permanent magnet.
5. A reciprocating vibration generator as set forth in claim 1 , wherein said fastening part has a recessed case and an end plate fastened to an open side of said recessed case, the first tube-shaped toroidal coil and the second tube-shaped toroidal coil are mounted on a printed circuit board, and said end plate has a through hole of a size enabling passage of said toroidal coil.
6. A reciprocating vibration generator as set forth in claim 5 , wherein said end plate has a conductive projection contacting a conductive rubber piece adhered to a back surface of said printed circuit board through a notch formed in said printed circuit board.
7. The reciprocating vibration generator according to claim 1 , wherein the reciprocating vibrator further comprising a ring-shaped weight provided on the ring-shaped permanent magnet.
8. The reciprocating vibration generator according to claim 1 , further comprising a core running through an inside of the tube-shaped toroidal coil and an inside of the second tube-shaped toroidal coil.
9. A reciprocating vibration generator comprising:
a reciprocating vibrator having a ring-shaped permanent magnet at a center hole of a ring-shaped weight;
suspension spring means for supporting said reciprocating vibrator with respect to a fastening part in a manner able to be elastically displaced in a thickness direction extending between a first end face and a second end face;
a tube-shaped toroidal coil running through a center hole of said ring-shaped permanent magnet and generating a reciprocating vibration magnetic field for driving said ring-shaped permanent magnet to reciprocate in said thickness direction; and
a core running through the inside of said toroidal coil, wherein:
said ring-shaped permanent magnet is magnetized in said thickness direction, and said toroidal coil has a first toroidal coil and a second toroidal coil coaxial with and adjacent to the same,
wherein said fastening part has a recessed case and an end plate fastened to an open side of said recessed case, said toroidal coil is mounted on a printed circuit board, and said end plate has a through hole of a size enabling passage of said toroidal coil,
wherein said end plate has a conductive projection contacting a conductive rubber piece adhered to a back surface of said printed circuit board through a notch formed in said printed circuit board.