Patent ID: 6994530

Claim:
A vibration type compressor, in which a compressor main body is housed in a gastight vessel comprising a power supply terminal, a suction pipe into which a low-pressure refrigerant flows and a delivery pipe from which a high-pressure refrigerant flows, the compressor main body comprising: a cylindrical yoke; a magnetic path member formed from a column-shaped core pole which closes an end of said cylindrical yoke and protrudes to inside said cylindrical yoke coaxially via a cylindrical core pole side, said magnetic path member cooperating with said cylindrical yoke to define a magnetic path along a longitudinal direction of said magnetic path member; a cylindrical permanent magnet arranged in the magnetic path; a mechanical vibration system; an electromagnetic coil which is arranged within a gap between the magnetic path member and the cylindrical permanent magnet by being supported by said mechanical vibration system so as to be able to vibrate and said electromagnetic coil being wound around a lead plate to function as the connection of a terminal thereof; a supporting member which supports the electromagnetic coil; a piston connected to the electromagnetic coil through the supporting member; and a cylinder block which closes the other end of the cylindrical yoke and defines with said yoke and said magnetic path member an interior formed as a low-pressure chamber communicating with the suction pipe, a high-pressure chamber communicating with the delivery pipe and a cylinder housing the piston, the vibration type compressor being so configured as to vibrate the piston connected to the electromagnetic coil by supplying an alternating current to the electromagnetic coil and to discharge a compressed high-pressure refrigerant from the delivery pipe, said cylindrical permanent magnet being formed from a neodymium magnet or a rare-earth magnet and said cylindrical permanent magnet being divided into at least four parts in the axial direction thereof, the divided magnet being bonded and fixed to said cylindrical core pole side, wherein said four parts of the divided magnet are evenly spaced from each other providing a defined gap between opposite ends of each of said four parts and said four parts are arranged around on the outer surface of said column-shaped core pole.